584,882 people (2024 Census estimate, +1.4% since 2020)
184 square miles of land · 3,182 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.
5 active community water systems list Delaware County in the area they serve, reporting 148,535 people served in all (a system that crosses county lines counts its whole population).
| CHESTER WATER AUTHORITY surface water · local government · PA1230004 | 140,437 served |
| VEOLIA WATER BETHEL buys surface water · private · PA1230012 | 7,809 served |
| BRINTON MANOR groundwater · private · PA1230006 | 196 served |
| PATHWAYS groundwater · private · PA1230886 | 53 served |
| SOUTHPOINT HOMEOWNERS ASSOC groundwater · private · PA1230026 | 40 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 1,247 people were held in Delaware County's jail, in Vera's latest figure (2023), or 337 per 100,000 residents ages 15–64. In 2018 it was about 1,770.
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.
15 school districts have their office in Delaware County. School taxes are usually the largest part of a property tax bill.
Spent $269 million — $211.4 million to run schools, about $16,918 per student, plus $41.7 million on buildings and equipment. Money in: $116.9 million local (mostly property tax), $105 million state, $33.5 million federal. Long-term debt: $86.3 million.
Spent $150.7 million — $125.8 million to run schools, about $18,958 per student, plus $14.3 million on buildings and equipment. Money in: $118.1 million local (mostly property tax), $26.9 million state, $2.5 million federal. Long-term debt: $144.1 million.
Spent $145 million — $119.1 million to run schools, about $21,578 per student, plus $18.6 million on buildings and equipment. Money in: $82.7 million local (mostly property tax), $38.1 million state, $6.7 million federal. Long-term debt: $73.6 million.
Spent $135 million — $111.6 million to run schools, about $24,140 per student, plus $14.6 million on buildings and equipment. Money in: $53.1 million local (mostly property tax), $57.3 million state, $15.5 million federal. Long-term debt: $49.3 million.
Spent $113.7 million — $106.2 million to run schools, about $23,493 per student, plus $2.4 million on buildings and equipment. Money in: $101.5 million local (mostly property tax), $22.8 million state, $1.3 million federal. Long-term debt: $87.9 million.
Spent $88.3 million — $69.5 million to run schools, about $15,829 per student, plus $10.8 million on buildings and equipment. Money in: $68.9 million local (mostly property tax), $16.9 million state, $1.4 million federal. Long-term debt: $130.5 million.
Spent $113.3 million — $95.3 million to run schools, about $23,003 per student, plus $12.1 million on buildings and equipment. Money in: $94.4 million local (mostly property tax), $19.4 million state, $1.6 million federal. Long-term debt: $62.4 million.
Spent $107.3 million — $88.2 million to run schools, about $21,382 per student, plus $6.4 million on buildings and equipment. Money in: $47.5 million local (mostly property tax), $47.4 million state, $12.7 million federal. Long-term debt: $48 million.
And 7 more.
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 Moderate compared with other U.S. counties. FEMA estimates natural hazards cost Delaware County about $134.9 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Very High; social vulnerability: Relatively Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
389 bridges in Delaware County: 97 in good condition, 249 fair, and 43 poor (11.1%). “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.
| INTERSTATE 95(SB) over US 322 EB & RAMP A · built 1967 | 117,917 vehicles a day |
| WANAMAKER AVENUE over I-95 AND RAMPS · built 1975 | 45,201 vehicles a day |
| MEDIA BY-PASS over RIDLEY CK.RD;RIDLEY CK. · built 1959 | 34,005 vehicles a day |
| CONCHESTER HIGHWAY over CSX RAILROAD · built 1949 | 32,167 vehicles a day |
| E. LANCASTER AVE over BRANCH BROWNS RUN · built 1960 | 31,662 vehicles a day |
| STATE ROAD over DARBY CREEK · built 1950 | 29,754 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $258.6 million of work in Delaware County in fiscal 2025, about $448 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 Pennsylvania 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 Delaware 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 Delaware County built: brayden.ozark@gmail.com.
More of Pennsylvania: the state government and every county in Pennsylvania.
Nearby counties: Philadelphia County (15 mi) · Gloucester County, NJ (19 mi) · Chester County (19 mi) · Montgomery County (20 mi) · Salem County, NJ (24 mi) · Camden County, NJ (24 mi).