First three digits · Delaware
ZIP Codes Starting with
44 ZIP codes start with 199, sorted at the Wilmington, DE (SCF 197) sectional center (USPS labeling list L005, effective October 1, 2026) in Delaware: 39 residential ZIP codes across 2 counties and 5 PO Box or single-organization codes (Census 2020 ZCTAs and GeoNames postal codes, October 2026).
What do the digits 199 mean?
The first digit, 1, is one of ten national areas (Delaware, New York and Pennsylvania). The first three, 199, route mail to a sectional center: USPS labeling list L005 (effective October 1, 2026) sends letters for 199 to the Wilmington, DE (SCF 197) facility. The last two digits pick the delivery area. By residents, the largest town names among the 199 ZIP codes are Dover, Millsboro, Lewes, Smyrna, Seaford and Milford.
The same facility sorts 4 prefixes, 149 ZIP codes in all: 193, 197, 198, 199.
Where are the 199 ZIP codes?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
All ZIP codes starting with 199
| County | ||||||
|---|---|---|---|---|---|---|
| 19901 | Dover | Kent County | 37,763 | 498 | $66k | $273k |
| 19902 | Dover Afb | Kent County | 44 | 11 | – | – |
| 19903 | Dover | Kent County | PO Box or unique | – | – | – |
| 19904 | Dover | Kent County | 38,818 | 899 | $67k | $309k |
| 19905 | Dover | Kent County | PO Box or unique | – | – | – |
| 19906 | Dover | Kent County | PO Box or unique | – | – | – |
| 19930 | Bethany Beach | Sussex County | 3,014 | 515 | $126k | $887k |
| 19931 | Bethel | Sussex County | 375 | 314 | $99k | $295k |
| 19933 | Bridgeville | Sussex County | 10,597 | 158 | $61k | $269k |
| 19934 | Camden Wyoming | Kent County | 14,061 | 302 | $87k | $336k |
| 19936 | Cheswold | Kent County | 152 | 738 | $34k | $110k |
| 19938 | Clayton | Kent County | 9,561 | 198 | $100k | $381k |
| 19939 | Dagsboro | Sussex County | 7,490 | 288 | $90k | $421k |
| 19940 | Delmar | Sussex County | 7,540 | 183 | $65k | $235k |
| 19941 | Ellendale | Sussex County | 3,435 | 113 | $75k | $244k |
| 19943 | Felton | Kent County | 13,410 | 215 | $74k | $312k |
| 19944 | Fenwick Island | Sussex County | 636 | 512 | $121k | $1.19M |
| 19945 | Frankford | Sussex County | 9,640 | 155 | $88k | $443k |
| 19946 | Frederica | Kent County | 5,603 | 243 | $81k | $303k |
| 19947 | Georgetown | Sussex County | 20,760 | 174 | $71k | $322k |
| 19950 | Greenwood | Sussex County | 7,918 | 109 | $75k | $293k |
| 19951 | Harbeson | Sussex County | 2,245 | 251 | $96k | $472k |
| 19952 | Harrington | Kent County | 10,908 | 120 | $77k | $283k |
| 19953 | Hartly | Kent County | 5,255 | 176 | $82k | $247k |
| 19954 | Houston | Kent County | 1,427 | 146 | $60k | $317k |
| 19955 | Kenton | Kent County | 352 | 3,556 | $45k | $226k |
| 19956 | Laurel | Sussex County | 16,327 | 163 | $66k | $260k |
| 19958 | Lewes | Sussex County | 31,938 | 676 | $97k | $535k |
| 19960 | Lincoln | Sussex County | 6,774 | 224 | $67k | $276k |
| 19961 | Little Creek | Kent County | PO Box or unique | – | – | – |
| 19962 | Magnolia | Kent County | 13,770 | 942 | $104k | $374k |
| 19963 | Milford | Sussex County | 23,500 | 224 | $71k | $323k |
| 19964 | Marydel | Kent County | 1,418 | 175 | $99k | $330k |
| 19966 | Millsboro | Sussex County | 35,884 | 403 | $78k | $318k |
| 19967 | Millville | Sussex County | 2,376 | 1,464 | $98k | $483k |
| 19968 | Milton | Sussex County | 15,486 | 242 | $87k | $437k |
| 19969 | Nassau | Sussex County | PO Box or unique | – | – | – |
| 19970 | Ocean View | Sussex County | 8,524 | 914 | $94k | $527k |
| 19971 | Rehoboth Beach | Sussex County | 14,886 | 829 | $102k | $609k |
| 19973 | Seaford | Sussex County | 26,834 | 319 | $64k | $278k |
| 19975 | Selbyville | Sussex County | 10,862 | 425 | $89k | $463k |
| 19977 | Smyrna | Kent County | 27,704 | 333 | $77k | $341k |
| 19979 | Viola | Kent County | 619 | 189 | $72k | $294k |
| 19980 | Woodside | Kent County | 268 | 1,150 | $85k | $350k |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; GeoNames postal codes (CC BY 4.0) for codes without a residential area.