State profile · DE
Delaware ZIP Codes
Demographics, income, and housing across every ZIP code in Delaware, benchmarked against all 50 states, DC and Puerto Rico.
- 67
- ZIP codes
- 897,925
- Population
- $89,586
- Avg ZIP income
- 3
- Counties
The verdict
Texas leads ZIP coverage at 1,935 ZCTAs (#1 of 52). That is not the income board: New Jersey's unweighted average ZIP household income is $121,992 (#1 of 52) on 595 ZCTAs. Delaware sits #51 of 52 by ZIP count at income #12.
- Texas
- ZIP-count #1 (1,935)
- New Jersey
- income #1 ($121,992)
- #51
- of 52 by ZIP count
- #12
- of 52 by avg income
ZIP-count and income are separate boards among 52 reporting states and territories. Income is the unweighted mean of each ZIP's ACS 2019–2023 median household income, so a rural code counts the same as a dense metro.
Above-median income on a shorter ZIP list (67 codes · 53 cities). Household income averages $89,586 (12th of 52 by avg ZIP income). Compact geography means city pages carry more of the contrast than a giant county table; open the largest city first, then one smaller market, rather than scanning every ZIP.
The largest city, Wilmington (215,619), holds a moderate share (~24%) of state ZIP population. Expect a primary metro plus a long tail of mid-size markets: the top-cities chart and county RankBars both matter, and a two-ZIP compare inside vs outside Wilmington usually beats reading the state average alone.
Compact ZIP geography: the state page is closer to a directory than a mega-atlas. Prefer the largest city page and its primary ZIP over scanning every county, and keep the FAQ answers as the quick census totals.
Largest cities in Delaware
Top 10 cities by population in Delaware
Total resident population aggregated from every ZIP code the Census assigns to each city.
- Wilmington
Wilmington, DE
215,619 residents
- Newark
Newark, DE
138,967 residents
- Dover 69,187
Dover, DE
69,187 residents
- New Castle 59,250
New Castle, DE
59,250 residents
- Bear 39,194
Bear, DE
39,194 residents
- Middletown 35,107
Middletown, DE
35,107 residents
- Millsboro 24,601
Millsboro, DE
24,601 residents
- Seaford 23,838
Seaford, DE
23,838 residents
- Smyrna 22,984
Smyrna, DE
22,984 residents
- Lewes 19,650
Lewes, DE
19,650 residents
What this shows Wilmington leads, but several peers sit close enough that this top-10 chart is a shortlist, not a single-city story – compare two of those metros before trusting the state mean.
Counties in Delaware
Which cities have the most ZIPs in Delaware?
Side-by-side: Compare 19720 vs 19702 →
ZIP Codes in Delaware
More DE ZIP codes
Official Data Resources for Delaware
Compact ZIP geography: start at Census ACS for Delaware, then BLS wages for the labor-market side of the same small map.
Frequently Asked Questions
Is Delaware compact enough to browse ZIP by ZIP?
Yes – 67 codes and 3 counties put Delaware in compact geography. Prefer the largest city page and its primary ZIP; the roll-ups here are quick census totals, not a substitute for opening one urban and one thin-edge code.
Does Delaware's above-median ZIP income mean every market is expensive?
No. The unweighted ZIP mean ($89,586) still mixes dense suburbs with thinner edges, and home values average $377,721. Open the densest metro and one thin-edge county before reading affordability from the state line alone.
Which Delaware cities should I open first?
Start with Wilmington (215,619, ~24% of ZIP population), then one mid-size market from the largest-cities chart. A two-ZIP compare inside vs outside Wilmington usually beats reading the state average alone. Other large markets include Newark, Dover, New Castle.
Take this with you
What to do with Delaware's numbers, next.
- See how Delaware compares to a neighboring state on the same Census fields Compare states
- Check where Delaware's ZIP codes rank nationally on income, education, or homeownership View national rankings
- Save a ZIP code to your shortlist to track alongside others you're considering View your shortlist
Figures describe 2019–2023 ACS 5-Year Estimates aggregated from ZIP Code Tabulation Areas (ZCTAs), Census Bureau approximations of USPS ZIP codes, not any single address.
Source: U.S. Census Bureau, American Community Survey (ACS) 5-Year Estimates (2019–2023); USPS ZIP Code Tabulation Areas via the HUD USPS Crosswalk.
Read our methodology to see how this data is sourced, computed, and verified.