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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)

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

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