| Back to United States. City: Arnold, MD Population (2000): 21,001
Housing units: 7,712 Land area: 9.4 sq. mi. Water area: 0.0 sq. mi. White population: 19398 Black population: 851 American Indian population: 32 Asian population: 319 Native Hawaiian and Other Pacific Islander population: 6 Some other race population: 116 Two or more races population: 279 Urban population: 21001 Rural population: 0 Median age: 37.5 Average household size: 2.76 Median household income (1999): $76326
 
Nearest zip codes: 21405, 21401, 21146, 21402, 214HH, 21056.
Year house built:
- 1999 to March 2000: 146
- 1995 to 1998: 493
- 1990 to 1994: 735
- 1980 to 1989: 2166
- 1970 to 1979: 2352
- 1960 to 1969: 758
- 1950 to 1959: 578
- 1940 to 1949: 228
- 1939 or earlier: 265
Bedrooms in owner-occupied houses in Arnold, MD (21012):
- no bedroom: 1
- 1 bedrooms: 79
- 2 bedrooms: 735
- 3 bedrooms: 2652
- 4 bedrooms: 2333
- 5 or more bedrooms: 690
Bedrooms in renter-occupied apartments and housing units:
- no bedroom: 17
- 1 bedrooms: 141
- 2 bedrooms: 352
- 3 bedrooms: 394
- 4 bedrooms: 117
- 5 or more bedrooms: 0
Vehicles available in 21012 zip code in owner-occupied houses:
- no vehicle: 116
- 1 vehicle: 1291
- 2 vehicles: 3354
- 3 vehicles: 1269
- 4 vehicles: 349
- 5 or more vehicles: 111
Vehicles available in renter-occupied housing units:
- no vehicle: 51
- 1 vehicle: 478
- 2 vehicles: 349
- 3 vehicles: 119
- 4 vehicles: 18
- 5 or more vehicles: 6
Estimate of home value of owner-occupied houses in 2000 in zip code 21012:
- Less than $10,000: 0
- $10,000 to $14,999: 0
- $15,000 to $19,999: 0
- $20,000 to $24,999: 0
- $25,000 to $29,999: 12
- $30,000 to $34,999: 0
- $35,000 to $39,999: 0
- $40,000 to $49,999: 0
- $50,000 to $59,999: 0
- $60,000 to $69,999: 25
- $70,000 to $79,999: 36
- $80,000 to $89,999: 32
- $90,000 to $99,999: 177
- $100,000 to $124,999: 607
- $125,000 to $149,999: 871
- $150,000 to $174,999: 891
- $175,000 to $199,999: 727
- $200,000 to $249,999: 1013
- $250,000 to $299,999: 512
- $300,000 to $399,999: 538
- $400,000 to $499,999: 227
- $500,000 to $749,999: 157
- $750,000 to $999,999: 96
- $1,000,000 or more: 39
First ancestries reported:
- German: 3267
- Irish: 2820
- English: 2404
- Other groups: 1939
- Italian: 1581
- United States or American: 1370
- Scottish: 557
- Polish: 520
- French (except Basque): 375
- European: 278
- Scotch-Irish: 253
- French Canadian: 194
- Norwegian: 184
- Russian: 178
- British: 168
- Dutch: 164
- Swedish: 158
- Welsh: 158
- Austrian: 85
- Lithuanian: 84
- Danish: 81
- Ukrainian: 80
- Greek: 68
- Canadian: 59
- Scandinavian: 55
- Hungarian: 52
- Swiss: 49
- Czechoslovakian: 47
- Slovak: 44
- Pennsylvania German: 43
- Czech: 42
- Portuguese: 36
- Turkish: 32
- Maltese: 31
- Eastern European: 28
- Subsaharan African:: 20
- Jamaican: 18
- West Indian (excluding Hispanic groups):: 18
- Lebanese: 16
- Arab:: 16
- Slavic: 15
- Nigerian: 8
- Latvian: 8
- African: 7
- Romanian: 7
- Slovene: 6
- Soviet Union: 6
- Cape Verdean: 5
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