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The 21139 ZIP Code is centered1 in Baltimore County at latitude 39.407 and longitude -76.648 (Panoramio Photos). It is a PO Box type ZIP Code. Baltimore County is in the Eastern Time Zone (UTC -5 hours) and observes daylight savings time.
Riderwood, MD 21139 Map (Marker is ZIP Code Centroid)
Local Search, 21139 ZIP Code| Distance & Driving Directions
Nearby Cities, Towns & Census Designated Places
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Thornleigh, MD
(< 0.1 mile) Ruxton, MD (< 0.1 mile) Riderwood, MD (< 0.1 mile) Riderwood Hills, MD (1.4 miles ENE) Rockland, MD (1.4 miles WSW) |
Malvern, MD
(1.4 miles SSE) Orchard Hills, MD (1.4 miles ENE) Marlywood, MD (1.4 miles ESE) Lutherville, MD (1.4 miles NE) Lake, MD (1.4 miles SSE) |
Nearby Neighborhoods, Subdivisions & Other Small Populated Places
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York Ridge, MD
(< 0.1 mile) Sunset Knoll, MD (< 0.1 mile) Sorrento, MD (< 0.1 mile) Ruxton Hills, MD (< 0.1 mile) Ruxton Ridge, MD (< 0.1 mile) |
Ridervale, MD
(< 0.1 mile) Bridleshire, MD (< 0.1 mile) Boxwood, MD (1.4 miles NNW) Brightwood, MD (1.4 miles WSW) Hillside at Seminary, MD (1.4 miles NNW) |
ZIP Codes - Key Concepts
- ZIP Codes are categories for grouping mailing addresses and are not exact geographic regions.
- The centroid of a ZIP Code may be in one County and the associated city/town in another.
- In rural areas, a single ZIP Code may be used for cities and towns in several different Counties / Independent Cities.
- ZIP Code "areas" can overlap, be subsets of each other, or be artificial constructs with no geographic area.
- ZIP Codes are only loosely tied to cities.
1 Keeping the above key concepts in mind, what we informally refer to as the "center" of a ZIP Code is most often actually the centroid of a polygon.
