Washington County GIS Map
Washington is one of the most repeated county names in the United States: there are 31 counties named Washington spread across 31 states. Each one is a different local government with its own boundary, population and flood maps, so the right GIS map depends on which state you mean.
That is also why a search for Washington GIS turns up several unrelated county systems — the name on its own does not tell you which state's mapping office you are after. Pick the state you need below.
Every county page opens an interactive GIS map of that county's official Census boundary, with FEMA flood zones, USGS elevation contours, land cover and school districts you can turn on, plus population, land area and ZIP code data.
Most people searching for Washington County mean Washington County, Oregon — the largest of them, with a population of about 603,947.
All 31 Washington Counties by state
Ordered by population, largest first.
- Washington CountyOregon (OR) 603,947 724.3 sq mi
- Washington CountyMinnesota (MN) 276,238 384.8 sq mi
- Washington CountyArkansas (AR) 256,765 941.5 sq mi
- Washington CountyPennsylvania (PA) 210,042 857 sq mi
- Washington CountyUtah (UT) 196,431 2,427.6 sq mi
- Washington CountyMaryland (MD) 155,709 457.8 sq mi
- Washington CountyWisconsin (WI) 137,879 430.6 sq mi
- Washington CountyTennessee (TN) 136,261 326.5 sq mi
- Washington CountyRhode Island (RI) 130,344 329.3 sq mi
- Washington CountyNew York (NY) 60,522 831.2 sq mi
- Washington CountyVermont (VT) 60,017 687.1 sq mi
- Washington CountyOhio (OH) 58,978 632 sq mi
- Washington CountyVirginia (VA) 53,926 561.2 sq mi
- Washington CountyOklahoma (OK) 53,326 415.5 sq mi
- Washington ParishLouisiana (LA) 45,120 669.6 sq mi
- Washington CountyMississippi (MS) 42,765 724.1 sq mi
- Washington CountyTexas (TX) 36,647 604.2 sq mi
- Washington CountyMaine (ME) 31,331 2,562.7 sq mi
- Washington CountyIndiana (IN) 28,212 513.7 sq mi
- Washington CountyFlorida (FL) 25,529 584.7 sq mi
- Washington CountyMissouri (MO) 23,470 759.9 sq mi
- Washington CountyIowa (IA) 22,561 568.8 sq mi
- Washington CountyNebraska (NE) 21,106 389.9 sq mi
- Washington CountyGeorgia (GA) 19,849 678.5 sq mi
- Washington CountyAlabama (AL) 15,143 1,080.3 sq mi
- Washington CountyIllinois (IL) 13,627 562.6 sq mi
- Washington CountyKentucky (KY) 12,140 297.3 sq mi
- Washington CountyIdaho (ID) 11,142 1,452.9 sq mi
- Washington CountyNorth Carolina (NC) 10,812 346.5 sq mi
- Washington CountyKansas (KS) 5,533 894.8 sq mi
- Washington CountyColorado (CO) 4,831 2,518.1 sq mi