239,807 people (2024 Census estimate, +0.4% since 2020)
26 square miles of land · 9,224 people per square mile
“Highest” and “lowest” are just order, not grades: a high rank for poverty or hazard losses means more of it. Each figure's source is in its section below.
2 active community water systems list Arlington County in the area they serve, reporting 216,352 people served in all (a system that crosses county lines counts its whole population).
| ARLINGTON COUNTY buys surface water · local government · VA6013010 | 215,000 served |
| ARLINGTON COUNTY - WILLSTON AREA buys surface water · local government · VA6013500 | 1,352 served |
Source: U.S. EPA Safe Drinking Water Information System (SDWIS), active community systems, . Look up any system's violations and test results with EPA's search using its ID.
About 334 people were held in Arlington County's jail, in Vera's latest figure (2025). In 2020 it was about 219.
Source: Vera Institute of Justice, Incarceration Trends (built from federal Bureau of Justice Statistics jail surveys). Counties without their own jail, or that share one, may show no figure.
1 school district has its office in Arlington County. School taxes are usually the largest part of a property tax bill.
Spent $752.1 million — $645.6 million to run schools, about $23,424 per student, plus $60.1 million on buildings and equipment. Money in: $636.1 million local (mostly property tax), $103 million state, $30.2 million federal. Long-term debt: $482 million.
Source: U.S. Census Bureau, 2023 Annual Survey of School System Finances. Districts are listed by the county of their main office; some serve neighboring counties too.
Source: County Health Rankings & Roadmaps 2025 (University of Wisconsin Population Health Institute), which gathers federal data (CDC, Census, and others); measures cover different recent years. Blank lines aren't reported for small counties.
Overall risk: Relatively Low compared with other U.S. counties. FEMA estimates natural hazards cost Arlington County about $37.8 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively High; social vulnerability: Very Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
183 bridges in Arlington County: 25 in good condition, 152 fair, and 6 poor (3.3%). “Poor” means a main part — the deck, the beams, or the supports — is rated 4 or lower on the federal 0–9 scale. It doesn't mean unsafe to drive; unsafe bridges are closed.
| JEFF DAVIS HWY.SBL over 110; I-395NB & I-395 EXP · built 1976 | 15,947 vehicles a day |
| N.GLEBE & O.DOMI.D over YORKTOWN BOULEVARD · built 1965 | 12,355 vehicles a day |
| ARLINGTON RIDGE RD over FOUR MILE RUN · built 1956 | 12,022 vehicles a day |
| OLD GLEBE ROAD over RTE. 120 N. GLEBE ROAD · built 1964 | 5,752 vehicles a day |
| SOUTH ROTARY over RTE. 395 · built 1973 | 4,818 vehicles a day |
| 2ND STREET over RTE. 27 (WASHINGTON BLVD · built 1965 | 4,804 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $304.9 million of work in Arlington County in fiscal 2025, about $1,278 per resident — to the county, cities, schools, hospitals, nonprofits and others.
Source: USAspending.gov, grants by place of performance, fiscal 2025 (Oct. 2024 to Sept. 2025). Search it by county to see each award.
From Grants.gov: posted grants listing county governments as eligible, soonest deadline first; research-only and overseas programs left out; list updated 2026-10-13, refreshed weekly. 62 are open in all. Cities, towns, school districts and nonprofits have their own lists there.
General election: Tuesday, November 3, 2026. Early voting: 2026-09-18 to 2026-10-31. Last day to register to vote: 2026-10-23. Mail ballot request deadline: 2026-10-23. Election Day: 2026-11-03.
Source: Virginia Department of Elections: upcoming elections · Virginia Department of Elections: voter FAQ · Virginia Department of Elections: absentee voting
The budget, property tax rates, audits, local officials and offices for Arlington County come from the county's own records, which we haven't gathered — not gathered, never hidden. See what a full county site looks like, or ask to have Arlington County built: brayden.ozark@gmail.com.
More of Virginia: the state government and every county in Virginia.
Nearby counties: Falls Church city (4 mi) · Alexandria city (4 mi) · District of Columbia, DC (5 mi) · Fairfax County (10 mi) · Fairfax city (11 mi) · Prince George's County, MD (14 mi).