First three digits · Delaware
ZIP Codes Starting with
27 ZIP codes start with 197, sorted at the Wilmington, DE (SCF 197) sectional center (USPS labeling list L005, effective October 1, 2026) in Delaware: 19 residential ZIP codes across 1 county and 8 PO Box or single-organization codes (Census 2020 ZCTAs and GeoNames postal codes, October 2026).
What do the digits 197 mean?
The first digit, 1, is one of ten national areas (Delaware, New York and Pennsylvania). The first three, 197, route mail to a sectional center: USPS labeling list L005 (effective October 1, 2026) sends letters for 197 to the Wilmington, DE (SCF 197) facility. The last two digits pick the delivery area. By residents, the largest town names among the 197 ZIP codes are Newark, New Castle, Middletown, Bear, Hockessin and Claymont.
The same facility sorts 4 prefixes, 149 ZIP codes in all: 193, 197, 198, 199.
Where are the 197 ZIP codes?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
All ZIP codes starting with 197
| County | ||||||
|---|---|---|---|---|---|---|
| 19701 | Bear | New Castle County | 42,984 | 1,618 | $111k | $373k |
| 19702 | Newark | New Castle County | 55,683 | 1,982 | $92k | $346k |
| 19703 | Claymont | New Castle County | 15,460 | 3,893 | $77k | $285k |
| 19706 | Delaware City | New Castle County | 2,038 | 805 | $84k | $263k |
| 19707 | Hockessin | New Castle County | 17,376 | 1,318 | $173k | $557k |
| 19708 | Kirkwood | New Castle County | PO Box or unique | – | – | – |
| 19709 | Middletown | New Castle County | 53,234 | 686 | $133k | $471k |
| 19710 | Montchanin | New Castle County | no residents | 0 | – | – |
| 19711 | Newark | New Castle County | 49,432 | 1,804 | $95k | $399k |
| 19712 | Newark | New Castle County | PO Box or unique | – | – | – |
| 19713 | Newark | New Castle County | 30,747 | 2,365 | $77k | $293k |
| 19714 | Newark | New Castle County | PO Box or unique | – | – | – |
| 19715 | Newark | New Castle County | PO Box or unique | – | – | – |
| 19716 | Newark | New Castle County | no residents | 0 | – | – |
| 19717 | Newark | New Castle County | 6,036 | 23,395 | – | – |
| 19718 | Newark | New Castle County | PO Box or unique | – | – | – |
| 19720 | New Castle | New Castle County | 62,392 | 1,629 | $75k | $265k |
| 19721 | New Castle | New Castle County | PO Box or unique | – | – | – |
| 19725 | Newark | New Castle County | PO Box or unique | – | – | – |
| 19726 | New Castle | New Castle County | PO Box or unique | – | – | – |
| 19730 | Odessa | New Castle County | 425 | 630 | $112k | $323k |
| 19731 | Port Penn | New Castle County | 655 | 259 | $71k | $369k |
| 19732 | Rockland | New Castle County | 89 | 51 | $236k | $581k |
| 19733 | Saint Georges | New Castle County | 186 | 1,691 | $83k | $305k |
| 19734 | Townsend | New Castle County | 14,214 | 178 | $128k | $431k |
| 19735 | Winterthur | New Castle County | no residents | 0 | – | – |
| 19736 | Yorklyn | New Castle County | 127 | 841 | – | – |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; GeoNames postal codes (CC BY 4.0) for codes without a residential area.