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Wildland Urban Interface (WUI) areas in the U.S.

Area in WUI by State | Number of Houses in WUI by State

Area of Wildland-Urban Interface (WUI) by State
State	Total area	Area of WUI (km²⁾
State	km²	1990	2000	2010	Expansion of WUI Area (km²) 1990-2010	Percent Change in WUI Area 1990-2010
Alabama	135,767	22,877	28,552	31,044	8,167	35.7%
Arizona	295,235	5,695	7,118	8,814	3,118	54.7%
Arkansas	137,732	10,977	14,554	16,393	5,415	49.3%
California	423,967	22,618	24,375	27,026	4,407	19.5%
Colorado	269,602	5,713	7,600	9,438	3,725	65.2%
Connecticut	14,358	8,026	8,232	8,512	486	6.1%
Delaware	6,446	692	882	980	288	41.6%
Florida	170,310	18,504	22,570	26,159	7,655	41.4%
Georgia	153,911	29,667	37,165	41,853	12,186	41.1%
Idaho	216,442	2,451	3,318	4,220	1,769	72.2%
Illinois	149,995	3,539	3,944	4,286	747	21.1%
Indiana	94,326	7,638	9,254	10,491	2,853	37.4%
Iowa	145,746	1,331	1,625	1,779	448	33.7%
Kansas	213,100	1,932	2,258	2,539	608	31.5%
Kentucky	104,656	18,874	23,858	25,691	6,818	36.1%
Louisiana	135,659	13,235	15,006	16,468	3,232	24.4%
Maine	91,634	13,271	15,673	17,761	4,490	33.8%
Maryland	32,131	7,035	7,859	8,099	1,064	15.1%
Massachusetts	27,336	10,587	11,059	11,466	879	8.3%
Michigan	250,487	22,464	26,557	29,067	6,603	29.4%
Minnesota	225,162	7,507	8,735	10,023	2,516	33.5%
Mississippi	125,438	16,785	21,668	24,352	7,567	45.1%
Missouri	180,540	10,233	13,123	15,499	5,267	51.5%
Montana	380,831	3,168	4,079	5,304	2,135	67.4%
Nebraska	200,329	1,048	1,159	1,233	185	17.6%
Nevada	286,380	1,513	2,069	2,440	927	61.2%
New Hampshire	24,214	8,246	8,919	9,969	1,723	20.9%
New Jersey	22,591	6,660	6,912	6,995	335	5.0%
New Mexico	314,918	4,901	6,195	6,859	1,958	39.9%
New York	141,297	32,328	36,012	39,519	7,192	22.2%
North Carolina	139,391	42,795	49,888	54,956	12,161	28.4%
North Dakota	183,124	471	560	673	202	42.9%
Ohio	116,098	15,624	18,208	20,104	4,480	28.7%
Oklahoma	181,037	9,934	11,726	13,684	3,750	37.7%
Oregon	254,800	7,792	8,469	9,447	1,655	21.2%
Pennsylvania	119,280	36,127	39,460	41,720	5,593	15.5%
Rhode Island	4,001	1,514	1,580	1,634	120	7.9%
South Carolina	82,933	20,411	25,561	27,874	7,463	36.6%
South Dakota	199,729	937	1,110	1,399	462	49.3%
Tennessee	109,153	21,494	27,261	30,722	9,228	42.9%
Texas	695,661	31,565	39,319	46,449	14,884	47.2%
Utah	219,884	2,197	2,735	3,549	1,352	61.5%
Vermont	24,906	6,142	7,190	8,663	2,521	41.0%
Virginia	110,787	26,631	31,935	35,832	9,201	34.6%
Washington, D.C.	177	10	10	8	-2	-20.7%
Washington	184,661	11,464	13,125	14,991	3,527	30.8%
West Virginia	62,755	14,176	16,367	17,557	3,381	23.9%
Wisconsin	169,635	10,492	11,828	14,349	3,858	36.8%
Wyoming	253,334	1,541	1,868	2,412	871	56.5%
Total	8,081,886	580,831	688,529	770,301	189,470	32.6%

Number of houses in the WUI Interface

Houses in the Wildland-Urban Interface (WUI) by State
State	All houses 1990	Houses in the WUI 1990	All houses 2000	Houses in the WUI 2000	All houses 2010	Houses in the WUI 2010	Expansion of WUI homes 1990-2010	Percent change in WUI homes 1990-2010
State	Number	Number	Number	Number	Number	Number	Number	Percent
Alabama	1,670,379	912,226	1,963,711	1,126,380	2,171,853	1,269,955	357,729	39.2%
Arizona	1,659,430	633,572	2,189,189	948,314	2,844,526	1,318,387	684,815	108.1%
Arkansas	1,000,667	415,321	1,173,043	518,026	1,316,299	593,256	177,935	42.8%
California	11,182,882	3,309,716	12,214,549	3,788,536	13,680,081	4,426,803	1,117,087	33.8%
Colorado	1,477,349	541,780	1,808,037	724,688	2,212,898	940,552	398,772	73.6%
Connecticut	1,320,850	680,497	1,385,975	734,259	1,487,891	800,454	119,957	17.6%
Delaware	289,919	28,249	343,072	39,344	405,885	42,116	13,867	49.1%
Florida	6,100,262	1,478,928	7,302,947	1,966,812	8,989,580	2,628,053	1,149,125	77.7%
Georgia	2,638,418	1,230,849	3,281,737	1,585,327	4,088,801	1,964,288	733,439	59.6%
Idaho	413,327	171,968	527,824	222,080	667,796	273,601	101,633	59.1%
Illinois	4,506,275	345,667	4,885,615	382,862	5,296,715	405,329	59,662	17.3%
Indiana	2,246,046	266,553	2,532,319	316,309	2,795,541	348,300	81,747	30.7%
Iowa	1,143,669	85,783	1,232,511	96,741	1,336,417	99,430	13,647	15.9%
Kansas	1,044,112	149,304	1,131,200	161,872	1,233,215	175,872	26,568	17.8%
Kentucky	1,506,845	533,690	1,750,927	644,332	1,927,164	691,215	157,525	29.5%
Louisiana	1,716,241	661,151	1,847,181	751,922	1,964,981	838,021	176,870	26.8%
Maine	587,045	442,154	651,901	508,009	721,830	576,989	134,835	30.5%
Maryland	1,891,917	518,387	2,145,283	632,955	2,378,814	705,543	187,156	36.1%
Massachusetts	2,472,711	1,031,635	2,621,989	1,131,158	2,808,254	1,219,921	188,286	18.3%
Michigan	3,847,926	804,902	4,234,279	962,147	4,532,233	1,062,135	257,233	32.0%
Minnesota	1,848,445	322,868	2,065,946	375,692	2,347,201	411,784	88,916	27.5%
Mississippi	1,010,423	523,946	1,161,953	643,058	1,274,719	734,564	210,618	40.2%
Missouri	2,199,129	386,208	2,442,017	485,566	2,712,729	571,359	185,151	47.9%
Montana	361,155	223,898	412,633	260,012	482,825	308,567	84,669	37.8%
Nebraska	660,620	106,848	722,668	113,355	796,793	117,513	10,665	10.0%
Nevada	518,858	186,463	827,457	300,475	1,173,814	536,403	349,940	187.7%
New Hampshire	503,904	388,639	547,024	428,921	614,754	490,791	102,152	26.3%
New Jersey	3,075,310	745,783	3,310,275	825,241	3,553,562	898,982	153,199	20.5%
New Mexico	632,058	400,342	780,579	519,693	901,388	615,076	214,734	53.6%
New York	7,226,891	1,528,848	7,679,307	1,669,391	8,108,103	1,797,720	268,872	17.6%
North Carolina	2,818,193	1,394,594	3,523,944	1,813,508	4,327,528	2,256,276	861,682	61.8%
North Dakota	276,340	40,882	289,677	44,807	317,498	52,234	11,352	27.8%
Ohio	4,371,945	686,107	4,783,051	774,046	5,127,508	825,683	139,576	20.3%
Oklahoma	1,406,499	489,840	1,514,400	548,959	1,664,378	620,122	130,282	26.6%
Oregon	1,193,567	423,481	1,452,708	508,545	1,675,562	595,949	172,468	40.7%
Pennsylvania	4,938,140	1,753,205	5,249,750	1,922,115	5,567,315	2,021,129	267,924	15.3%
Rhode Island	414,572	114,310	439,837	128,646	463,388	142,751	28,441	24.9%
South Carolina	1,424,155	810,830	1,753,670	1,057,033	2,137,683	1,302,246	491,416	60.6%
South Dakota	292,436	73,676	323,208	83,579	363,438	96,660	22,984	31.2%
Tennessee	2,026,067	701,050	2,439,443	898,516	2,812,133	1,034,597	333,547	47.6%
Texas	7,008,999	1,947,531	8,157,575	2,378,191	9,977,436	3,042,930	1,095,399	56.2%
Utah	598,388	268,902	768,594	350,964	979,709	467,828	198,926	74.0%
Vermont	271,214	183,196	294,382	202,890	322,539	229,140	45,944	25.1%
Virginia	2,496,334	991,416	2,904,192	1,233,938	3,364,939	1,446,470	455,054	45.9%
Washington, D.C.	278,489	6,348	274,845	5,297	296,719	4,371	-1,977	-31.1%
Washington	2,032,378	669,997	2,451,075	836,795	2,885,677	1,010,550	340,553	50.8%
West Virginia	781,295	618,290	844,623	671,653	881,917	697,069	78,779	12.7%
Wisconsin	2,055,768	389,869	2,321,144	443,695	2,624,358	512,339	122,470	31.4%
Wyoming	203,411	162,983	223,854	180,206	261,868	212,789	49,806	30.6%
Total	101,641,253	30,782,682	115,183,120	36,946,860	130,878,255	43,434,112	12,651,430	41.1%

(Source: Martinuzzi, Sebastián; Stewart, Susan I.; Helmers, David P.; Mockrin, Miranda H.; Hammer, Roger B.; Radeloff, Volker C. 2015. The 2010 wildland-urban interface of the conterminous United States. Research Map NRS-8. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station. 124 p. [includes pull-out map].)

Download Area and Homes in the Wildland Urban Interface table (pdf)

For additional information, please contact Cherie LeBlanc Fisher.

Last Modified: February 16, 2018

Publications & Products

Wildland Urban Interface (WUI) areas in the U.S.

Area in WUI by State | Number of Houses in WUI by State

Area of Wildland-Urban Interface (WUI) by State

Number of houses in the WUI Interface

Houses in the Wildland-Urban Interface (WUI) by State