Olney, MD Profile: Facts, Map & Data


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Olney, Maryland - Basic Facts

The Olney Census Designated Place is a community or populated place (Class Code U5) located in Montgomery County at latitude 39.1443 and longitude -77.0714. Montgomery County is in the Eastern time zone (GMT -5). The elevation is 541 feet.

The formal official name is the Olney Census Designated Place, but most people and references simply refer to it as Olney, Maryland.

The U5 Census Class Code for Olney indicates a populated place that is also a census designated place with the same name.. The Census Designated Place has a Functional Status Code "S" which identifies a statistical entity.

The formal boundaries for the Olney Census Designated Place (see map below) encompass a land area of 16.2 sq. miles and a water area of 0.05 sq. miles.

Alternate Unofficial Names for Olney: Fair Hill, Machanicsville, Mechanicsville.

Olney Census Designated Place, MD Boundary Map


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Olney, MD Data & Demographics (As of July 1, 2014)


Total Population 34,919
Population in Households 34,758
Population in Familes 31,560
Population in Group Qrtrs 161
Population Density1 2,156
Diversity Index2 57


Total Households 11,951
Average Household Size 2.91
Family Households 9,696
Average Family Size 3


Total Housing Units 12,190 (100%)
Owner Occupied HU 10,377 (85.1%)
Renter Occupied HU 1,574 (12.9%)
Vacant Housing Units 239 ( 2.0%)
Median Home Value $503,360
Average Home Value $535,541


Median Household Income $129,210
Average Household Income $153,736
Per Capita Income $52,672
  (Compound Annual Growth Rates)


2010-2014 2014-2019
Population 0.74% 0.87%
Households 0.69% 0.83%
Families 0.61% 0.76%
Median Household Income   3.78%
Per Capita Income   3.7%
1) Population Density = Total Population per square mile.
2) The Diversity Index is a scale of 0 to 100 that represents the likelyhood 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.
Based on Census 2010 counts, the Diversity Index for the United States was 60.6 and it is expected to increase to 64.8 by July 1, 2018.


Olney, MD - Peer Comparisons by Rank and Percentile

The table below compares Olney to the other 518 incorporated cities, towns and CDPs in Maryland by rank and percentile using July 1, 2014 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.

Variable Description Rank Percentile
Total Population # 29 95th
Population Density1 # 172 67th
Diversity Index2 # 118 77th
Median Household Income # 37 93rd
Per Capita Income # 42 92nd

Additional comparisons and rankings can be made with a VERY EASY TO USE Maryland Census Data Comparison Tool.