702,250 people (2024 Census estimate, +4.7% since 2020)
61 square miles of land · 11,489 people per square mile
4 active community water systems list District of Columbia in the area they serve, reporting 669,534 people served in all (a system that crosses county lines counts its whole population).
| D.C. WATER AND SEWER AUTHORITY buys surface water · local government · DC0000002 | 632,323 served |
| JOINT BASE ANACOSTIA - BOLLING buys surface water · federal · DC0000004 | 20,411 served |
| NAVAL STATION WASHINGTON - WNY buys surface water · federal · DC0000003 | 16,800 served |
| WASHINGTON AQUEDUCT DIVISION. surface water · federal · DC0000001 | 0 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 1,858 people were held in District of Columbia's jail, in Vera's latest figure (2024), or 386 per 100,000 residents ages 15–64. In 2019 it was about 1,870.
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 District of Columbia. School taxes are usually the largest part of a property tax bill.
Spent $1.9 billion — $1.6 billion to run schools, about $32,682 per student, plus $296.6 million on buildings and equipment. Money in: $1.7 billion local (mostly property tax), $0 state, $204.7 million federal.
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 High compared with other U.S. counties. FEMA estimates natural hazards cost District of Columbia about $292.5 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Very High; social vulnerability: Relatively Moderate.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
261 bridges in District of Columbia: 90 in good condition, 166 fair, and 5 poor (1.9%). “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.
| T. ROOSEVELT BRID over POT RIVER & POTOMAC · built 1964 | 95,000 vehicles a day |
| H STREET over WASHINGTON TERMINAL YARD · built 1907 | 24,000 vehicles a day |
| RAMP FR BENNING RD over SB KENILWORTH AVE · built 1955 | 5,000 vehicles a day |
| JOYCE ROAD over LUZON BRANCH · built 1950 | 2,100 vehicles a day |
| EDGEWATER STABLE A over ROCK CREEK · built 1958 | 50 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $4.9 billion of work in District of Columbia in fiscal 2025, about $7,124 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.
Registration deadlines, early voting and polling places for District of Columbia are on the federal site vote.gov, which links to the state's official election office.
The budget, property tax rates, audits, local officials and offices for District of Columbia 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 District of Columbia built: brayden.ozark@gmail.com.
More of District of Columbia: the state government and every county in District of Columbia.
Nearby counties: Arlington County, VA (5 mi) · Alexandria city, VA (7 mi) · Falls Church city, VA (9 mi) · Prince George's County, MD (10 mi) · Fairfax County, VA (15 mi) · Fairfax city, VA (16 mi).