597,933 wildfire and 892,638 structure-fire incidents attributed to undetermined / missing across the US in 1992–2025. They scorched 33,713,696 acres. Linked to 5,920 civilian deaths.
Year-by-year incidents from 1992–2025.
50 states ranked by cumulative undetermined / missing incidents.
Top 50 counties by cumulative undetermined / missing incidents.
| # | County | State | Incidents | Acres |
|---|---|---|---|---|
| 1 | Los Angeles County | CA | 29,922 | 294,099 ac |
| 2 | Maricopa County | AZ | 19,212 | 103,027 ac |
| 3 | Cook County | IL | 17,288 | — |
| 4 | Queens County | NY | 16,020 | 533 ac |
| 5 | Riverside County | CA | 15,433 | 154,428 ac |
| 6 | San Joaquin County | CA | 14,250 | 16,513 ac |
| 7 | Pima County | AZ | 13,933 | 169,185 ac |
| 8 | Sacramento County | CA | 11,235 | 18,740 ac |
| 9 | Harris County | TX | 10,792 | 2,766 ac |
| 10 | Wayne County | MI | 10,679 | 118 ac |
| 11 | San Bernardino County | CA | 10,237 | 184,945 ac |
| 12 | Fresno County | CA | 8,849 | 443,089 ac |
| 13 | Dallas County | TX | 8,489 | 724 ac |
| 14 | Philadelphia County | PA | 8,438 | — |
| 15 | San Diego County | CA | 8,325 | 184,678 ac |
| 16 | Honolulu County | HI | 7,704 | 50,466 ac |
| 17 | Santa Clara County | CA | 7,317 | 419,429 ac |
| 18 | Oklahoma County | OK | 7,220 | 8,288 ac |
| 19 | Orange County | CA | 7,204 | 131,916 ac |
| 20 | King County | WA | 6,884 | 532 ac |
| 21 | Tulare County | CA | 6,566 | 16,591 ac |
| 22 | Kern County | CA | 6,401 | 191,139 ac |
| 23 | Suffolk County | NY | 5,971 | 2,650 ac |
| 24 | Bexar County | TX | 5,505 | 3,620 ac |
| 25 | El Paso County | CO | 5,031 | 113,805 ac |
| 26 | Merced County | CA | 4,966 | 25,132 ac |
| 27 | Milwaukee County | WI | 4,881 | 26 ac |
| 28 | Clark County | NV | 4,763 | 4,392 ac |
| 29 | Tarrant County | TX | 4,564 | 6,134 ac |
| 30 | Jackson County | MO | 4,419 | 23 ac |
| 31 | Alameda County | CA | 4,190 | 5,328 ac |
| 32 | Jefferson County | AL | 4,176 | 3,879 ac |
| 33 | Pulaski County | AR | 4,000 | 2,036 ac |
| 34 | Hidalgo County | TX | 3,694 | 28,796 ac |
| 35 | Shelby County | TN | 3,520 | — |
| 36 | Stanislaus County | CA | 3,489 | 22,575 ac |
| 37 | Pierce County | WA | 3,457 | 2,494 ac |
| 38 | Arapahoe County | CO | 3,330 | 4,155 ac |
| 39 | Jefferson County | CO | 3,260 | 7,893 ac |
| 40 | Madera County | CA | 3,196 | 18,595 ac |
| 41 | Weld County | CO | 3,133 | 28,431 ac |
| 42 | Denver County | CO | 3,132 | 3,710 ac |
| 43 | Marion County | IN | 2,994 | — |
| 44 | Multnomah County | OR | 2,971 | 453 ac |
| 45 | Franklin County | OH | 2,957 | — |
| 46 | Solano County | CA | 2,948 | 6,397 ac |
| 47 | Snohomish County | WA | 2,924 | 113 ac |
| 48 | Cuyahoga County | OH | 2,847 | — |
| 49 | Berkeley County | SC | 2,810 | 17,220 ac |
| 50 | Travis County | TX | 2,785 | 10,693 ac |
Top 50 cities (NFIRS structure-fire matches only).
| # | City | State | Incidents | Loss |
|---|---|---|---|---|
| 1 | Phoenix | AZ | 16,353 | $12.4M |
| 2 | New York | NY | 14,222 | — |
| 3 | Chicago | IL | 11,563 | $82.0M |
| 4 | Los Angeles | CA | 10,435 | $120.3M |
| 5 | Stockton | CA | 10,291 | $71.6M |
| 6 | Tucson | AZ | 9,748 | $21.5M |
| 7 | Detroit | MI | 8,560 | $246.7M |
| 8 | Philadelphia | PA | 8,430 | $12.4M |
| 9 | Houston | TX | 7,702 | $227.6M |
| 10 | San Jose | CA | 5,249 | $102.4M |
| 11 | Sacramento | CA | 5,057 | $25.8M |
| 12 | Oklahoma City | OK | 4,278 | $123.8M |
| 13 | Dallas | TX | 4,136 | $155.5M |
| 14 | Milwaukee | WI | 4,015 | $138.6M |
| 15 | San Antonio | TX | 3,811 | $128.0M |
| 16 | Fresno | CA | 3,664 | $43.9M |
| 17 | Las Vegas | NV | 3,232 | $55.4M |
| 18 | Memphis | TN | 2,954 | $28.1M |
| 19 | Kansas City | MO | 2,823 | $1.1B |
| 20 | Indianapolis | IN | 2,800 | $79.2M |
| 21 | Denver | CO | 2,710 | $63.6M |
| 22 | Little Rock | AR | 2,614 | $37.9M |
| 23 | Portland | OR | 2,587 | $24.3M |
| 24 | Washington | DC | 2,437 | $29.0M |
| 25 | Seattle | WA | 2,337 | $44.0M |
| 26 | Long Beach | CA | 2,258 | $43.0M |
| 27 | Columbus | OH | 2,073 | $50.6M |
| 28 | San Francisco | CA | 1,972 | $52.3M |
| 29 | Jacksonville | FL | 1,959 | — |
| 30 | Austin | TX | 1,936 | $73.3M |
| 31 | Birmingham | AL | 1,913 | $40.8M |
| 32 | Flint | MI | 1,746 | $29.8M |
| 33 | Tulsa | OK | 1,734 | $24.3M |
| 34 | San Diego | CA | 1,730 | $58.2M |
| 35 | Louisville | KY | 1,672 | $55.0M |
| 36 | Santa Ana | CA | 1,642 | $10.3M |
| 37 | Columbia | SC | 1,562 | $17.7M |
| 38 | Topeka | KS | 1,502 | $8.3M |
| 39 | Kansas City | KS | 1,440 | $18.0M |
| 40 | Porterville | CA | 1,432 | $8.1M |
| 41 | Shreveport | LA | 1,396 | $10.1M |
| 42 | Merced | CA | 1,388 | $11.4M |
| 43 | Las Cruces | NM | 1,384 | $5.1M |
| 44 | Boston | MA | 1,365 | $93.7M |
| 45 | Corpus Christi | TX | 1,359 | $25.9M |
| 46 | Cincinnati | OH | 1,354 | $33.3M |
| 47 | Tacoma | WA | 1,343 | $235.7M |
| 48 | Atlanta | GA | 1,336 | $42.3M |
| 49 | Baton Rouge | LA | 1,333 | $67.5M |
| 50 | Montgomery | AL | 1,329 | $38.7M |
FireVerge's cause profiles use the 13 ignition categories defined by the FPA FOD (Fire Program Analysis Fire-Occurrence Database, 6th edition: 2.3M wildfire records, 1992–2020). NFIRS CAUSE_IGN codes from 11.4M structure incidents (2021–2025) are cross-classified into the same taxonomy where they align cleanly. Wildfires (FOD) and structure fires (NFIRS) are tracked as separate sources because their data captures very different things — FOD records every wildfire ignition in the US, while NFIRS counts emergency-department responses.