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1 20705? 301 Beltsville, Prince George's County, MD
pop. 15,690
| 1 20706 301 Lanham, Prince George's County, MD
pop. 18,190
| 1 20707? 240?,301? Laurel, Anne Arundel, Howard, Prince George's County, MD
pop. 22,125
| 1 20715? 301 Bowie, Prince Georges County, MD
pop. 53,878
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1 20737? 301 Riverdale, Prince George's County, MD
pop. 6,630
| 1 20740? 301 College Park, Prince George's County, MD
pop. 25,171
| 1 20744? 301 Fort Washington, Prince George's County, MD
pop. 23,845
| 1 20747? 301 District Heights, Prince George's County, MD
pop. 6,296
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1 20770? 301 Greenbelt, Prince George's County, MD
pop. 22,242
| 1 20780? 240,301 Hyattsville, Prince George's County, MD
pop. 16,677
| 1 20814? 240,301 Bethesda, Montgomery County, MD
pop. 55,277
| 1 20832? 301 Olney, Montgomery County, MD
pop. 31,438
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1 20850? 240,301 Rockville, Montgomery County, MD
pop. 57,402
| 1 20877? 301? Gaithersburg, Montgomery County, MD
pop. 57,698
| 1 20907? 240,301 Silver Spring, Montgomery County, MD
pop. 76,540
| 1 20913? 301 Takoma Park, Montgomery County, MD
pop. 18,540
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1 21014? 410? Bel Air, Harford County, MD
pop. 10,014
| 1 21043? 410? Ellicott City, Howard County, MD
pop. 56,397
| 1 21045? 301 Columbia, Howard County, MD
pop. 88,254
| 1 21157? 410? Westminster, Carroll County, MD
pop. 17,761
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1 21203? 301,410?,443? Baltimore, Anne Arundel, Baltimore County, MD
pop. 635,815
| 1 21204? 410? Towson, Baltimore County, MD
pop. 51,793
| 1 21401? 410? Annapolis, Anne Arundel County, MD
pop. 36,300
| 1 21502? 240?,301? Cumberland, Allegany County, MD
pop. 20,915
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1 21601? 410? Easton, Talbot County, MD
pop. 13,447
| 1 21701? 301?,240? Frederick, Frederick County, MD
pop. 57,907
| 1 21740? 301? Hagerstown, Washington County, MD
pop. 38,326
| 1 21801? 410? Salisbury, Wicomico County, MD
pop. 26,295
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1 21842? 410? Ocean City, Worcester County, MD
pop. 7,049
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