ZIP Code 21042
21042 is one of Maryland's ZIP codes, delivering to addresses in Ellicott City, Howard County.
- City
- Ellicott City
- County
- Howard County
- State
- Maryland
- Prefix
- 210xx
Where this code sits
21042 is part of the 210xx range, the group of codes handled by one mail processing centre. Ellicott City is served by 3 ZIP codes in total.
Area codes over the same ground
Postal and telephone geography are drawn separately, so these codes cover the area 21042 delivers to without sharing its boundary.
- 227 Area code 227
- 240 Area code 240
- 301 Area code 301
- 410 Area code 410
- 443 Area code 443
- 667 Area code 667
ZIP codes nearest 21042
| ZIP code | Distance | Delivers to |
|---|---|---|
| ZIP code 21043 | 3.5 mi | Ellicott City, MD |
| ZIP code 21044 | 4.1 mi | Columbia, MD |
| ZIP code 21045 | 4.9 mi | Columbia, MD |
| ZIP code 21041 | 5.0 mi | Ellicott City, MD |
| ZIP code 21150 | 5.0 mi | Simpsonville, MD |
| ZIP code 21104 | 5.1 mi | Marriottsville, MD |
| ZIP code 21163 | 5.4 mi | Woodstock, MD |
| ZIP code 21794 | 5.8 mi | West Friendship, MD |
Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Scope ZIP code 21042. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated . A ZIP code is a set of delivery routes, not an area; the point shown is a record coordinate, not a centre.