Arlington County, Virginia

Founding: 1801 (as Alexandria County)
Parent county: Fairfax

Namesake: Arlington House
Seat: Alexandria (1801–1870); Arlington (1870–)

Land area: 26 square miles

Population (2020): 238,643

Population (historic): 5,949 (1800); 9,573 (1830); 12,652 (1860); 6,430 (1900); 26,615 (1930)

Periods of population growth: pre-1800–1820; 1830–1970; 1980–2020

Subdivisions: None

National Register listings: 70 (plus 50 in Alexandria)

Pre-1940 residences (estimated): 10,136 (9.1%)
Pre-1940 housing survival rate: 60.5%

Housing in disrepair (1950): 1%

Average farmhouse value (1930): $4,813
Average outbuilding value (1930): $2,981
Number of farms (1920): 56
Average farm size (1920): 32.4 acres
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Alexandria (historic)

Namesake: Alexandria, Egypt

Founding: 1749 (platting); 1779 (incorporation)

Population (2020): 159,467

Population (historic): 2,748 (1790); 8,218 (1820); 8,734 (1850); 13,570 (1870); 14,528 (1900)

Periods of population growth: pre-1790–1970; 1980–2020
Pre-1940 residences (estimated): 6,414 (8.5%)
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Outstanding Buildings

1. *John Ball House (c. 1750/1885). 5620 South 3rd Street.
2. *The Glebe (1820/1850s). 4527 North 17th Street. Octagonal.
3. *Arlington / George Custis House (1803–1816). 321 Sherman Drive. Greek Revival.