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Mount Airy, MD 21771 ZIP Code Profile

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ZIP Code 21771: Basic Data & USPS Preferred City Name

Preferred Name, USPS

Mount Airy, MD 21771

ZIP Code Type: STANDARD
County: Frederick County
Centroid: Latitude 39.388, Longitude -77.148
Time Zone: Eastern Time Zone (UTC -5 hours)
Observes DST: Yes

ZIP Code 21771 has segments in 4 Counties / Independent Cities (Carroll, Frederick, Howard, Montgomery).

Businesses Addresses: 749
PO Box Addresses: 340
Residential Addresses: 10,610

Multi-Family Addresses: 105
Single Family Addresses: 10,505

The ZIP Code maps and database are updated 4 times per year.
Database updated: May 1, 2018, Maps updated: February 1, 2018.

EXTREMELY LOCAL Demographic Data

21771 ZIP Code Map

Mount Airy, MD 21771 Data & Demographics (As of July 1, 2017)

POPULATION
Total Population	31,051
Daytime Population: Workers	7,414
Daytime Population: Residents	14,011
Total Daytime Population (TDP)	21,425
Ratio TDP/Total Population¹	0.69
Population in Households	30,878
Population in Familes	27,953
Population in Group Qrtrs	173
Population Density²	375
Diversity Index³	24

INCOME
Median Household Income	$108,114
Average Household Income	$131,727
Per Capita Income	$43,971

HOUSING
Total Housing Units	10,658 (100%)
Owner Occupied HU	9,297 (87.2%)
Renter Occupied HU	1,020 ( 9.6%)
Vacant Housing Units	341 ( 3.2%)
Median Home Value	$422,613
Average Home Value	$452,536

HOUSEHOLDS
Total Households	10,317
Average Household Size	2.99
Family Households	8,461
Average Family Size	3

NOTES

If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
Population Density = Total Population per square mile.
The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.

GROWTH RATE / YEAR	2010-2017	2017-2022
Population	0.57%	0.68%
Households	0.53%	0.65%
Families	0.44%	0.59%
Median Household Income		1.05%
Per Capita Income		2.05%

Mount Airy, MD 21771 - Peer Comparisons by Rank and Percentile

The table below compares 21771 to the other 456 ZIP Codes in Maryland by rank and percentile using July 1, 2017 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.