As of 2020, the state of Delaware has a total of 98 postal codes. In the table below, you can see all Delaware zip codes listed by city, town and village as well as county affiliated. With 57 cities (and towns) and 3 counties (and county-equivalents), Delaware is the 45th largest state by population (952,065) and 49th largest one by land area (5,047 km2) in the United States.
The capital of Delaware is Wilmington and major cities include Dover, Newark, Middletown, and Smyrna.
List of Delaware Zip Codes by City
| # | City | Postal Code | County |
| 1 | Bear | 19701 | New Castle |
| 2 | Bethany Beach | 19930 | Sussex |
| 3 | Bethel | 19931 | Sussex |
| 4 | Bridgeville | 19933 | Sussex |
| 5 | Camden-Wyoming | 19934 | Kent |
| 6 | Cheswold | 19936 | |
| 7 | Claymont | 19703 | New Castle |
| 8 | Clayton | 19938 | Kent |
| 9 | Dagsboro | 19939 | Sussex |
| 10 | Delaware City | 19706 | |
| 11 | Delmar | 19940 | Sussex |
| 12 | Dover | 19901 | Kent |
| 13 | Dover | 19903 | |
| 14 | Dover | 19904 | |
| 15 | Dover | 19905 | |
| 16 | Dover Afb | 19902 | |
| 17 | Ellendale | 19941 | Sussex |
| 18 | Farmington | 19942 | |
| 19 | Felton | 19943 | Kent |
| 20 | Frankford | 19945 | Sussex |
| 21 | Frederica | 19946 | Kent |
| 22 | Georgetown | 19947 | Sussex |
| 23 | Greenwood | 19950 | Kent |
| 24 | Harbeson | 19951 | Sussex |
| 25 | Harrington | 19952 | Kent |
| 26 | Hartly | 19953 | Kent |
| 27 | Hockessin | 19707 | New Castle |
| 28 | Houston | 19954 | Kent |
| 29 | Kenton | 19955 | |
| 30 | Kirkwood | 19708 | |
| 31 | Laurel | 19956 | Sussex |
| 32 | Lewes | 19958 | Sussex |
| 33 | Lincoln | 19960 | Sussex |
| 34 | Little Creek | 19961 | |
| 35 | Magnolia | 19962 | Kent |
| 36 | Marydel | 19964 | Kent |
| 37 | Middletown | 19709 | New Castle |
| 38 | Milford | 19963 | Sussex |
| 39 | Millsboro | 19966 | Sussex |
| 40 | Millville | 19967 | Sussex |
| 41 | Milton | 19968 | Sussex |
| 42 | Montchanin | 19710 | |
| 43 | Nassau | 19969 | |
| 44 | New Castle | 19720 | New Castle |
| 45 | New Castle | 19721 | New Castle |
| 46 | Newark | 19702 | New Castle |
| 47 | Newark | 19711 | New Castle |
| 48 | Newark | 19712 | New Castle |
| 49 | Newark | 19713 | New Castle |
| 50 | Newark | 19714 | New Castle |
| 51 | Newark | 19715 | New Castle |
| 52 | Newark | 19716 | New Castle |
| 53 | Newark | 19717 | New Castle |
| 54 | Newark | 19718 | New Castle |
| 55 | Newark | 19725 | New Castle |
| 56 | Newark | 19726 | New Castle |
| 57 | Ocean View | 19970 | Sussex |
| 58 | Odessa | 19730 | |
| 59 | Port Penn | 19731 | |
| 60 | Rehoboth Beach | 19971 | Sussex |
| 61 | Rockland | 19732 | |
| 62 | Saint Georges | 19733 | |
| 63 | Seaford | 19973 | Sussex |
| 64 | Selbyville | 19944 | Sussex |
| 65 | Selbyville | 19975 | Sussex |
| 66 | Smyrna | 19977 | Kent |
| 67 | Townsend | 19734 | New Castle |
| 68 | Viola | 19979 | Kent |
| 69 | Wilmington | 19801 | New Castle |
| 70 | Wilmington | 19802 | New Castle |
| 71 | Wilmington | 19803 | New Castle |
| 72 | Wilmington | 19804 | New Castle |
| 73 | Wilmington | 19805 | New Castle |
| 74 | Wilmington | 19806 | New Castle |
| 75 | Wilmington | 19807 | New Castle |
| 76 | Wilmington | 19808 | New Castle |
| 77 | Wilmington | 19809 | New Castle |
| 78 | Wilmington | 19810 | New Castle |
| 79 | Wilmington | 19850 | New Castle |
| 80 | Wilmington | 19880 | New Castle |
| 81 | Wilmington | 19884 | New Castle |
| 82 | Wilmington | 19885 | New Castle |
| 83 | Wilmington | 19886 | New Castle |
| 84 | Wilmington | 19887 | New Castle |
| 85 | Wilmington | 19889 | New Castle |
| 86 | Wilmington | 19890 | New Castle |
| 87 | Wilmington | 19891 | New Castle |
| 88 | Wilmington | 19892 | New Castle |
| 89 | Wilmington | 19893 | New Castle |
| 90 | Wilmington | 19894 | New Castle |
| 91 | Wilmington | 19895 | New Castle |
| 92 | Wilmington | 19896 | New Castle |
| 93 | Wilmington | 19897 | New Castle |
| 94 | Wilmington | 19898 | New Castle |
| 95 | Wilmington | 19899 | |
| 96 | Winterthur | 19735 | New Castle |
| 97 | Woodside | 19980 | |
| 98 | Yorklyn | 19736 | New Castle |