US Volcano Map

Explore US map showing active volcanos, The United States is home to an array of active volcanoes, predominantly located in the Pacific Northwest and Hawaii. One of the most notable is Mount St. Helens in Washington, which famously erupted in 1980, causing significant destruction and loss of life. Hawaii’s Mauna Loa, the world’s largest volcano, continues to be highly active, with its last eruption recorded in 1984. Another significant volcanic feature is the Yellowstone Caldera in Wyoming, known as a supervolcano due to its vast size and explosive history. These volcanic regions are closely monitored by the United States Geological Survey (USGS) to assess risks and inform safety measures.

About US Volcano Map

Explore Volcano map of USA to locate all the active volcanos in U.S. and also see the location of active volcanos in past 2,000 years.

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Volcanoes in the United States

The United States is home to many awe-inspiring and geologically significant volcanoes, with the majority located in the western part of the country, particularly in the states of Alaska, Hawaii, California, Oregon, and Washington. These volcanoes are part of the Pacific Ring of Fire, known for its high seismic activity. This document delves into the notable volcanoes, their eruptions, and their implications.

Notable Volcanoes

Mount St. Helens, Washington

Mount St. Helens is perhaps the most famous volcano in the continental United States, primarily due to its catastrophic eruption on May 18, 1980. This eruption resulted in the largest landslide in recorded history and reduced the summit by 1,300 feet. It caused 57 fatalities and widespread devastation to surrounding areas. The volcano remains active, with frequent monitoring of its seismic activity and occasional minor eruptions.

Kīlauea, Hawaii

Kīlauea is one of the most active volcanoes on Earth, located on the Big Island of Hawaii. Its ongoing eruptions have been a constant feature since 1983, dramatically shaping the island's landscape. The 2018 eruption significantly impacted local communities, destroying over 700 homes and altering the island’s geography. Despite these disruptions, Kīlauea remains a central focus for scientific research.

Mount Rainier, Washington

Mount Rainier is a large stratovolcano that poses a significant threat due to its proximity to the Seattle metropolitan area. Standing at 14,411 feet, it's the tallest volcano in the Cascades Range. Due to its extensive glacial cover, an eruption could result in large lahars (volcanic mudflows) that might affect densely populated areas downstream. Its last major eruption occurred about 1,000 years ago, but it remains an active concern for volcanologists.

Mount Shasta, California

Another prominent volcano, Mount Shasta, is located in northern California. This stratovolcano last erupted in 1786, as recorded by the explorer La Perouse. Future eruptions are a possibility, though it's currently in a state of dormancy. Given its size and potential for activity, Mount Shasta is closely monitored by the U.S. Geological Survey.

Mauna Loa, Hawaii

Mauna Loa, another significant Hawaiian volcano, is considered the largest volcano on Earth in terms of volume and area covered. It has erupted 33 times since its first recorded eruption in 1843, with the most recent in 1984. Researchers continuously monitor Mauna Loa due to its potential for future eruptions.

Implications of Volcanic Activity

The implications of volcanic activity in the U.S. are multifaceted, affecting both the environment and human populations. Volcanic eruptions can lead to:

Lava Flows

These can destroy buildings, roads, and other infrastructure while also reshaping landscapes.

Ash Clouds

Volcanic ash can disrupt air travel, contaminate water supplies, and cause respiratory issues in humans and animals.

Lahars

These fast-moving volcanic mudflows can be particularly devastating, overwhelming communities in their path.

Climate Effects

Large eruptions can inject aerosols into the stratosphere, potentially leading to temporary global cooling.

Data and Facts

Number of Active Volcanoes

The United States has 161 potentially active volcanoes, primarily in Alaska and the western states.

Monitoring

The U.S. Geological Survey (USGS) operates five Volcano Observatories that continuously monitor volcanic activity. These include the Alaska Volcano Observatory (AVO) and the Hawaiian Volcano Observatory (HVO).

Recent Activity

Between 30-50 eruptions occur each year worldwide, with U.S. volcanoes contributing to this number. For example, in 2021, the AVO recorded over 10 eruptive events in Alaska alone.

List of Volcanoes in the United States

S.N.	Name	Elevation in Meters	Elevation in Feet	State	Last Eruption
1	Mount Bona	5,005	16,421	Alaska	847
2	Mount Blackburn	4,996	16,390	Alaska	3.4 million years ago
3	Mount Sanford	4,949	16,237	Alaska	320,000 years ago
4	Mount Churchill	4,766	15,632	Alaska	700 ± 200 years
5	Mount Rainier	4,392	14,411	Washington	1894
6	Mount Wrangell	4,317	14,163	Alaska	1999
7	Mount Shasta	4,317	14,162	California	1250
8	La Garita Caldera	4,274	14,022	Colorado	26.3 Ma
9	Mauna Kea	4,208	13,796	Hawaii	2460 BC ± 100 years
10	Mauna Loa	4,169	13,679	Hawaii	2022
11	Mount Jarvis	4,091	13,422	Alaska	1 million years ago
12	Never Summer Mountains	3,946	12,945	Colorado	24 to 29 million years ago
13	San Francisco Peaks	3,851	12,633	Arizona	92,000 years ago
14	Mount Adams	3,743	12,281	Washington	500 BC ± 1000 years
15	Marysvale Volcanic Field	3,694	12,137	Utah	19 million years ago
16	Mount Drum	3,661	12,010	Alaska	About 250,000 years ago
17	Sierra Blanca	3,652	11,981	New Mexico	26 million years ago
18	Jemez Mountains	3,525		New Mexico	60,000-50,000 years ago
19	Mount Baldy	3,480	11,420	Arizona	8-9 million years ago
20	Valles Caldera	3,430	11,253	New Mexico	50,000 to 60,000 years ago
21	Mount Hood	3,426	11,237	Oregon	1866
22	Long Valley Caldera	3,390	11,122	California	50,000 years ago
23	Mount Spurr	3,374	11,069	Alaska	1992
24	Mammoth Mountain	3,371	11,059	California	1260 AD ± 40 years
25	Mount Baker	3,285	10,778	Washington	1880
26	Glacier Peak	3,213	10,541	Washington	1700 ± 100 years
27	Mount Jefferson	3,199	10,492	Oregon	950 AD
28	Lassen Peak	3,189	10,462	California	1917
29	South Sister	3,158	10,360	Oregon	50 BC
30	Mount Redoubt	3,108	10,197	Alaska	2009
31	North Sister	3,075	10,090	Oregon	46,000 years ago
32	Middle Sister	3,063	10,050	Oregon	14,000 years ago
33	Haleakalā or East Maui Volcano	3,055	10,023	Hawaii	1750
34	Mount Iliamna	3,053	10,016	Alaska	1876
35	Hayes Volcano	3,034	9,954	Alaska	1200 ± 300 years
36	Mount McLoughlin	2,894	9,492	Oregon	20,000 to 30,000 years ago
37	Mount Shishaldin	2,857	9,373	Alaska	Ongoing
38	Black Buttes	2,857	9,373	Washington	500,000 to 300,000 years ago
39	Markagunt Plateau Volcanic Field	2,840	9,318	Utah	1050 AD
40	Mount Elden	2,834	9,299	Arizona	250,000 years ago
41	Yellowstone Plateau volcanic field	2,805	9,203	Idaho	70,000 years ago (magmatic) / 1350 BC ± 200 years (hydrothermal)
42	Yellowstone Plateau volcanic field	2,805	9,203	Wyoming	70,000 years ago (magmatic) / 1350 BC ± 200 years (hydrothermal)
43	Broken Top	2,800	9,185	Oregon	About 100,000 years ago
44	Mount Thielsen	2,800	9,184	Oregon	290,000 years ago
45	Mono Craters	2,796	9,173	California	1350 AD ± 20 years
46	Mount Bachelor	2,763	9,064	Oregon	5800 BC ± 750 years
47	Mount Gordon	2,755	9,039	Alaska	Holocene
48	Red Cones	2,748	9,015	California	8,500 years ago
49	Diamond Peak	2,665	8,744	Oregon	11,000 to 100,000 years ago
50	Inyo Craters	2,629	8,625	California	1380 CE ± 50 years
51	Mount Bailey	2,551	8,368	Oregon	11,000 to 100,000 years ago
52	Zuni-Bandera volcanic field	2,550	8,366	New Mexico	1,170 BC ± 300 years
53	Mount St. Helens	2,550	8,364	Washington	2008
54	Hualalai	2,521	8,270	Hawaii	1801
55	Mount Pavlof	2,519	8,264	Alaska	2022
56	Mount Veniaminof	2,507	8,225	Alaska	2021
57	Goat Rocks	2,494	8,184	Washington	500,000 years ago
58	Capulin Volcano	2,494	8,182	New Mexico	58,000-52,000 years ago
59	Crater Lake (Mount Mazama)	2,487	8,159	Oregon	2850 BC
60	Sunset Crater (San Francisco volcanic field)	2,447	8,026	Arizona	1075 AD ± 25 years
61	Isanotski Peaks	2,446	8,025	Alaska	Unknown
62	Mount Taylor	2,445	11,300	New Mexico	1,500,000 years ago
63	Newberry Caldera	2,434	7,986	Oregon	690 AD ± 100 years
64	Red Mountain	2,428	7,965	Arizona	740,000 years ago
65	Double Crater	2,426	7,959	Arizona	Pleistocene
66	Medicine Lake Volcano	2,412	7,913	California	1060 AD
67	Burney Mountain	2,397	7,863	California	280,000 ± 6,000 years ago
68	Three Fingered Jack	2,390	7,840	Oregon	40,000 to 80,000 years ago
69	Maiden Peak	2,380	7,810	Oregon	Pleistocene
70	Mount Washington	2,376	7,790	Oregon	700 AD
71	Capital Mountain	2,356	7,728	Alaska	1.02 million years ago
72	Mount Denison	2,318	7,606	Alaska	Probably Holocene
73	Mount Griggs	2,317	7,602	Alaska	1790 BC ± 40 years
74	Big Southern Butte	2,298	7,540	Idaho	300,000 years ago
75	Mount Steller	2,272	7,454	Alaska	Probably Holocene
76	Colton Crater	2,246	7,368	Arizona	1075 AD Sunset Crater and Unnamed Fissure vents
77	Dotsero	2,230	7,316	Colorado	2200 BC ± 300 years
78	Mount Chiginagak	2,221	7,287	Alaska	1998
79	Olallie Butte	2,200	7,219	Oregon	11,000 years ago or earlier
80	Tumble Buttes	2,191	7,188	California	10,000 - 15,000 years ago
81	Shiprock	2,188	7,177	New Mexico	27 million years ago
82	Mount Mageik	2,165	7,103	Alaska	500 BC ± 50 years
83	Snowy Mountain	2,162	7,093	Alaska	1710 ± 200 years
84	Mount Vsevidof	2,149	7,050	Alaska	1957
85	Pavlof Sister	2,142	7,027	Alaska	1786
86	SP Crater	2,141	7,021	Arizona	5,500 years ago
87	Mount Douglas	2,140	7,021	Alaska	Probably Holocene
88	Bald Knoll Volcanic Field	2,135	7,005	Utah	300,000 years ago or later
89	Cinder Cone and the Fantastic Lava Beds	2,105	6,907	California	1666
90	Fourpeaked	2,105	6,906	Alaska	2006
91	Belknap Crater	2,095	6,873	Oregon	480 AD
92	McDermitt Caldera	2,078	6,816	Nevada	16.39 ± 0.02 million years ago
93	McDermitt Caldera	2,078	6,816	Oregon	16.39 ± 0.02 million years ago
94	Merriam Cone	2,077	6,813	Arizona	150,000 years ago
95	Mount Katmai	2,047	6,716	Alaska	1912
96	Yucca Mountain	2,044	6,707	Nevada	80,000 years ago
97	Mount Kukak	2,043	6,703	Alaska	Holocene
98	Craters of the Moon	2,005	6,578	Idaho	130 BC ± 50 years
99	Pogromni	2,002	6,569	Alaska	Late Pleistocene
100	Strawberry Crater	1,989	6,526	Arizona	Late Pleistocene
101	Mount Recheschnoi	1,984	6,509	Alaska	3,000 years ago
102	Black Butte	1,962	6,436	Oregon	About 1,430,000 years ago
103	Cinnamon Butte	1,956	6,417	Oregon	4855 BC to 9,000 BC
104	Simcoe Mountains	1,954	6,410	Washington	631,000 ± 27,000 years ago
105	Devils Desk	1,954	6,409	Alaska	245,000 years ago
106	Black Butte	1,939	6,362	California	9,500 years ago
107	Frosty Peak Volcano	1,920	6,299	Alaska	Late Pleistocene or later
108	Juniper Buttes	1,905	6,250	Idaho	-
109	Mount Kupreanof	1,895	6,217	Alaska	1987
110	Roundtop Mountain	1,871	6,138	Alaska	9,100-10,000 years ago
111	Trident Volcano	1,864	6,115	Alaska	1975
112	Mount Martin	1,863	6,112	Alaska	1953
113	Albuquerque volcanic field	1,840	6,030	New Mexico	70,000-170,000 years ago
114	White Chuck Cinder Cone	1,830	6,002	Washington	Between 17,000 and 2,000 years ago
115	Mount Tanaga	1,806	5,925	Alaska	1914
116	Mount Makushin	1,800	5,905	Alaska	1995
117	Black Rock Desert Volcanic Field	1,800	5,904	Utah	1290 AD ± 150 years
118	West Maui Volcano	1,764	5,788	Hawaii	320,000 years ago
119	Mount Rogers Volcanic Center	1,750	5,730	Virginia	760 million years ago (Tonian)
120	Great Sitkin	1,740	5,709	Alaska	Ongoing
121	Carrizozo Malpais	1,731	5,679	New Mexico	3,250 BC ± 500 years ago
122	Mount Cleveland	1,730	5,676	Alaska	2020
123	Fort Rock	1,716	5,628	Oregon	13,500 to 18,000 years ago
124	Menan Buttes	1,713	5,619	Idaho	10,000 years ago
125	Saddle Butte	1,700		Oregon	430,000 ± 90,000 years ago
126	Alagogshak	1,675	5,495	Alaska	43,000 ± 8,000 years ago
127	Kohala (mountain)	1,670	5,480	Hawaii	120,000 years ago
128	Mount Westdahl	1,654	5,426	Alaska	1992
129	Twin Buttes	1,631	5,351	California	10,000 to 15,000 years ago
130	Mount Carlisle	1,620	5,315	Alaska	1987
131	Fumarole Butte	1,609	5,279	Utah	900,000 years ago
132	Kawaikini	1,598	5,243	Hawaii	4 million years ago
133	Mount Kialagvik	1,575	5,167	Alaska	Holocene
134	Gareloi Volcano	1,573	5,161	Alaska	1989
135	Jornada del Muerto Volcano	1,565	5,136	New Mexico	760,000 years ago
136	Stepovak Bay 3	1,555	5,102	Alaska	Probably Pleiocene
137	Kilbourne Hole	1,555	4,240	New Mexico	80,000 years ago
138	Mount Waialeale	1,544	5,066	Hawaii	-
139	Korovin Volcano	1,533	5,029	Alaska	2007
140	Pond Mountain Volcanic Center	1,518	4,980	North Carolina	760 million years ago
141	Kejulik Volcano	1,517	4,977	Alaska	Unknown
142	Indian Heaven	1,513	5,925	Washington	~6250 BC
143	Cima volcanic field	1,509	6,925	California	15,000 ± 5,000 years ago
144	Mount Dutton	1,506	4,941	Alaska	Holocene
145	Ugashik-Peulik	1,474	4,836	Alaska	1814
146	Santa Clara Volcanic Field	1,465	4,806	Utah	32,000 years ago
147	Lone Butte	1,457	4,780	Washington	Either 80,000 or 140,000 years ago ± 10,000 years
148	Diamond Craters	1,450	4,750	Oregon	5610 BC ± 470 years
149	Mount Takawangha	1,449	4,754	Alaska	Last few hundred years
150	Mount Emmons	1,436	4,711	Alaska	More than 10,000 years ago
151	Jackies Butte	1,418	4,652	Oregon	Holocene
152	Steamboat Springs	1,415	4,642	Nevada	1.14 million years ago
153	Jordan Craters	1,400	4,600	Oregon	1250 BC or later
154	Marble Mountain-Trout Creek Hill volcanic zone	1,378	4,521	Washington	~7700 years ago
155	Mount Dana	1,354	4,442	Alaska	1890 BC
156	Yantarni Volcano	1,345	4,413	Alaska	800 BC ± 500 years
157	Waianae Range	1,342	4,025	Hawaii	2.6 million years ago
158	Mount Aniakchak	1,341	4,400	Alaska	1931
159	Silver Star Mountain	1,330	4,364	Washington	Pluton formed 20 million years ago
160	West Crater	1,329	4,360	Washington	5750 BC
161	Mount Saint Helena	1,323	4,342	California	3.4 million years ago
162	Mount Konocti (Clear Lake Volcanic Field)	1,312	4,305	California	11,000 years ago
163	Mount Kanaga	1,307	4,288	Alaska	2012
164	Malapai Hill	1,304	4,278	California	15.93 ± 0.08 million years ago
165	Mount Akutan	1,303	4,275	Alaska	1996
166	Mount Herbert	1,280	4,199	Alaska	Unknown
167	Mount Si	1,270	4,167	Washington	-
168	Big Cave	1,259	4,131	California	38,000 ± 7,000 years ago
169	Mount Augustine	1,252	4,108	Alaska	2005
170	Soda Lakes	1,251	4,104	Nevada	Holocene
171	Kilauea	1,247	4,091	Hawaii	2023
172	Double glacier volcano	1,239	4,065	Alaska	Pleistocene
173	Blue Lake Crater	1,230	4,035	Oregon	680 AD ± 200 years
174	Semisopochnoi Island	1,221	4,006	Alaska	2023
175	Kiska Volcano	1,220	4,003	Alaska	1990
176	Mount Moffett	1,196	3,924	Alaska	1600 BC
177	Little Sitkin	1,174	3,852	Alaska	1830
178	Brushy Butte	1,174	3,852	California	12,000 years ago
179	Tana (volcano)	1,170	3,839	Alaska	Mid-late Holocene
180	Mount Segula	1,160	3,806	Alaska	A few hundred years ago
181	Chagulak Island	1,142	3,747	Alaska	Unknown
182	Mount Fisher	1,112	3,648	Alaska	1830
183	Mount Okmok	1,073	3,520	Alaska	2008
184	Mount Amukta	1,066	3,497	Alaska	1997
185	Pyre Peak	1,054	3,458	Alaska	1993
186	Black Peak	1,032	3,385	Alaska	1900 BCE ± 150 years
187	Lanai	1,026	3,366	Hawaii	1.2 million years ago
188	Mount Edgecumbe	970	3,132	Alaska	2220 BC ± 100 years
189	Agrigan	965	3,165	Northern Mariana Islands	1917
190	Trimble Knob	952	3,123	Virginia	35 million years ago (late Eocene)
191	Koʻolau Range	941	3,149	Hawaii	40,000 years ago
192	Ta'u-	931	3,054	American Samoa	30,000 years ago
193	Mount Kaguyak	901	2,956	Alaska	1650 BC
194	Kagamil Island	893	2,930	Alaska	1929
195	Trout Creek Hill	890	2,920	Washington	340,000 years ago
196	Uliaga Island	888	2,913	Alaska	Holocene
197	Asuncion Island	857	2,810	Northern Mariana Islands	1906
198	Novarupta	841	2,759	Alaska	1912
199	Buzzard Creek	830	2,723	Alaska	1050 BC
200	Mount Gilbert	818	2,684	Alaska	Unknown, fumaroles until 1948
201	Table Top-Wide Bay	792	2,598	Alaska	Holocene
202	Anatahan	788	2,592	Northern Mariana Islands	2008
203	Pisgah Crater	774	2,539	California	18,000 ± 5,000 years ago
204	Ubehebe Craters	752	2,467	California	150 BC
205	Alamagan	744	2,441	Northern Mariana Islands	1887
206	St. Michael volcanic field	715	2,346	Alaska	More recent than 500 BC
207	St. Michael volcanic field	715	2,346	Alaska	Within 3,000 years
208	Kookooligit Mountains	673	2,208	Alaska	Holocene
209	Cerros del Rio	664	2,178	New Mexico	2.2 million years ago
210	Buldir Volcano	656	2,152	Alaska	Holocene
211	Tutuila	653	2,142	American Samoa	440 CE
212	Sutter Buttes	650	2,130	California	1.5 million years ago
213	Mount Adagdak	645	2,115	Alaska	210,000 ± 5,000 years ago
214	Ofu-Olosega	639	2,096	American Samoa	1866 unnamed submarine cone eruption
215	Tumtum Mountain	611	2,004	Washington	70,000 years ago
216	Imuruk Lake	610	2,001	Alaska	300
217	Porcupine Mountains Central-Volcano	595	1,958	Michigan	1.093 billion years ago
218	Mole Hill	577	1,893	Virginia	47 million years ago (early Eocene)
219	Pagan Island	570	1,870	Northern Mariana Islands	2021
220	Mount Sergief	560	1,837	Alaska	Pleistocene
221	Yunaska Island	550	1,804	Alaska	1937
222	Pinnacle Peak	549	1,801	Washington	-
223	Taum Sauk Caldera	540	1,772	Missouri	1.485 billion years ago
224	Sarigan	538	1,765	Northern Mariana Islands	Unknown
225	Round Top	538	1,764	California	10 Million Years Ago
226	Nunivak Island	511	1,676	Alaska	300,000 years ago
227	Amak Volcano	488	1,601	Alaska	1796
228	Kaʻau Crater	462	1,516	Hawaii	35000 or 76000 years ago.
229	Kahoolawe	450	1,475	Hawaii	1 million years ago
230	Koko Crater	368	1,207	Hawaii	10,000 years ago
231	Farallon de Pajaros	360	1,180	Northern Mariana Islands	1967
232	Battle Mountain	354	1,162	Virginia	704 million years ago (Cryogenian)
233	Davidof Volcano	328	1,076	Alaska	Probably Holocene
234	Kasatochi Island	314	1,030	Alaska	2008
235	Rutan Hill	310	1,020	New Jersey	Ordovician
236	Mount Sylvania	298	978	Oregon	1 million years ago or earlier
237	Guguan	287	942	Northern Mariana Islands	1883
238	Koniuji Island	273	896	Alaska	1150 BC
239	Diamond Head	232	761	Hawaii	400,000 to 500,000 years ago
240	Battle Ground Lake	229	750	Washington	105,000 years ago
241	Maug Islands	227	745	Northern Mariana Islands	Pleistocene
242	Saint Paul Island	203	666	Alaska	1280 BC ± 40 years
243	St. Paul Island	203	666	Alaska	1280 BC ± 40 years
244	Hicks Dome	203	666	Illinois	400-345 million years ago
245	Ulupaʻu Crater	201	659	Hawaii	-
246	Hanauma Bay (Koko Head)	196	642	Hawaii	10,000 - 32,000 years ago
247	Ingakslugwat Hills	190	623	Alaska	Holocene
248	Pilot Knob	169	576	Texas	79 to 83 million years ago (late Cretaceous)
249	Bogoslof Island	150	492	Alaska	2017
250	Kauhakō Crater	150	490	Hawaii	230,000-300,000 years ago
251	Inge Mountain	125	410	Texas	Eocene or possibly Miocene
252	Puʻu Hawaiʻiloa	103	337	Hawaii	-
253	Ukinrek Maars	91	299	Alaska	1977
254	Tlevak Strait-Suemez Island	50	164	Alaska	Holocene/Post-glacial
255	Zealandia Bank	0	0	Northern Mariana Islands	Holocene
256	Supply Reef	-8	-26	Northern Mariana Islands	1989
257	Esmeralda Bank	-43	-141	Northern Mariana Islands	Holocene
258	East Diamante	-127	-417	Northern Mariana Islands	Holocene
259	Ahyi Seamount	-137	-449	Northern Mariana Islands	2023
260	South Sarigan Seamount	-184	-604	Northern Mariana Islands	2010
261	Fukujin Seamount	-217	-712	Northern Mariana Islands	1974
262	Ruby Seamount	-230	-755	Northern Mariana Islands	2023
263	Amboy Crater	-300	-984	California	23 million years ago 79,000 ± 5,000 years ago
264	Daikoku Seamount	-323	-1,060	Northern Mariana Islands	Holocene
265	Northwest Rota-1	-517	-1,696	Northern Mariana Islands	2004
266	Vailulu'u	-592	-1,842	American Samoa	2003 west of unnamed submarine caldera and nafauna
267	Kasuga Seamounts	-598	-1,962	Northern Mariana Islands	1959
268	Jackson Volcano	-880	-2,900	Mississippi	65 million years ago
269	Kamaʻehuakanaloa Seamount (Loihi)	-975	-3,199	Hawaii	1996
270	Midnight Volcano	-1,110	-3,641	Mississippi	66 million years ago
271	Seamount X	-1,230	-4,035	Northern Mariana Islands	Holocene
272	Forecast Seamount	-1,456	-4,777	Northern Mariana Islands	Holocene
273	Eifuku	-1,535	-5,036	Northern Mariana Islands	Holocene
274	Door Point Volcano	-2,200	-7,200	Louisiana	74-90 million years ago
275	Mount Tabor	-	636	Oregon	300,000 years ago or earlier
276	Espenberg	-	-	Alaska	17,500 years BP
277	Prindle Volcano	-	-	Alaska	Pleistocene
278	Malumalu	-	-	American Samoa	Last 8,000 years
279	Arlington Cone	-	-	Arizona	-
280	Black Bottom Crater	-	-	Arizona	-
281	Lenox Crater	-	-	Arizona	-
282	Maroon Crater	-	-	Arizona	-
283	Roden Crater	-	-	Arizona	400,000 years ago
284	San Francisco volcanic field	-	-	Arizona	1075 AD ± 25 years
285	Stewart Crater	-	-	Arizona	-
286	Uinkaret volcanic field	-	-	Arizona	1100 AD ± 75 years Little Springs Pyroclastic Cone
287	Big Pine volcanic field	-	-	California	17,000 years ago
288	Lassen Volcanic Center	-	-	California	1917
289	Pinnacles	-	-	California	23 million years ago
290	Pipkin	-	-	California	770,000 ± 40,000 years ago
291	Summer Coon	-	-	Colorado	24 to 34 million years ago
292	Kaʻena Point	-	-	Hawaii	Pleistocene Epoch
293	Koko Guyot	-	-	Hawaii	50 million years ago
294	Māhukona	-	-	Hawaii	About 470,000 years ago
295	Punchbowl Crater	-	-	Hawaii	400,000 to 500,000 years ago
296	Blue Creek	-	-	Idaho	-
297	Split Butte	-	-	Idaho	-
298	The Great Rift	-	-	Idaho	-
299	Shoshone volcano	-	-	Idaho	-
300	Cottonwood Caldera	-	-	Nevada	15.70 million years ago
301	Crater Flat (Southwest Nevada Volcanic Field)	-	-	Nevada	80,000 years ago
302	Indian Peak-Caliente Caldera Complex	-	-	Nevada	18 million years ago
303	Jessup area	-	-	Nevada	Jurassic
304	Lunar Crater volcanic field	-	-	Nevada	38,100 ± 10,000 years ago
305	Virgin Valley Caldera	-	-	Nevada	16.38 million years ago
306	Pawtuckaway Mountains	-	-	New Hampshire	Cretaceous
307	Ossipee Mountains	-	-	New Hampshire	Cretaceous
308	Hillsborough Caldera	-	-	North Carolina	630 million years ago
309	Bald Mountain Caldera	-	-	Oregon	3.4 to 4.6 million years ago
310	Brown Mountain	-	-	Oregon	12,000 to 60,000 years ago
311	Columbia River Basalt Group	-	-	Oregon	6.0 million years ago
312	Crooked River caldera	-	-	Oregon	29.5 million years ago
313	Gray Butte	-	-	Oregon	29.5 million years ago
314	Mahogany Mountain	-	-	Oregon	15.5 million years ago
315	Pelican Butte	-	-	Oregon	60,000 years ago or earlier
316	Rocky Butte	-	-	Oregon	30,000 to 90,000 years ago
317	Round Butte	-	-	Oregon	-
318	Strawberry Volcanics	-	-	Oregon	12.5 to 16.2 million years ago
319	Tower Mountain (Oregon)	-	-	Oregon	22.0 million years ago
320	Wildcat Mountain Caldera	-	-	Oregon	36.0 million years ago
321	Indian Peak-Caliente Caldera Complex	-	-	Utah	18 million years ago