People who speak Spanish

19.8% of Westchester County residents speak Spanish at home. Most Spanish-speakers in the county speak English "well" or "very well," while 24.5% of Spanish-speakers (4.9% of the total county population) do not speak English well. People who speak Spanish who don't speak English well are concentrated in Sleepy Hollow (22.9% of the village population), Port Chester (17.8%), Ossining (16.9%), and Elmsford (12.5%).

People who speak other Indo-European languages

8.3% of County residents speak an Indo-European language other than Spanish at home. Only 9.8% of these (0.8% of the county population) do not speak English well. Indo-European speakers who do not speak English well are not particularly concentrated in certain municipalities, but their ranks are highest in Mamaroneck Village (1.5%), Rye Brook (1.4%), Mount Vernon (1.2%), and Yonkers (1.2%).

People who speak Asian and Pacific Islander languages

Westchester's median household income as of the 2013-2017 U.S. Census American Community Survey was $89,968, which exceeds the median for New York State ($62,765) and the New York Metropolitan Area ($75,368). Westchester's communities include wide variations in median household and family incomes. Scarsdale's median household income as of 2013-2015 was over $250,000, the highest of any municipality in the county. New Castle and Bronxville followed at $211,105 and $205,781, respectively.

The only municipalities in the county with median household incomes below $60,000 are Mount Vernon ($54,573), Peekskill ($54,839), and Sleepy Hollow ($55,368).

For purposes of the 2010 Census and the American Community Survey, a housing unit may be a house, an apartment, a mobile home, a group of rooms, or a single room that is occupied (or, if vacant, is intended for occupancy) as separate living quarters. Separate living quarters are those in which the occupants live separately from any other individuals in the building and that have direct access from outside the building or through a common hall. For vacant units, the criteria of separateness and direct access are applied to the intended occupants whenever possible.  If that information cannot be obtained, the criteria are applied to the previous occupants.

Occupied housing unit
A housing unit is occupied if it is the usual place of residence of the person or group of people living in it at the time of enumeration or if the occupants are only temporarily absent, that is, away on vacation or business. The occupants may be a single family, one person living alone, two or more families living together, or any other group of related or unrelated people who share living quarters.

Vacant housing unit
A housing unit is vacant if no one is living in it at the time of enumeration, unless its occupants are only temporarily absent, or if no response is received to the Census Bureau’s questionnaire or housing unit canvassing. Units temporarily occupied at the time of enumeration entirely by people who have a usual residence elsewhere are classified as vacant.

Tenure
All occupied housing units are classified as either owner-occupied or renter-occupied.

Year structure built
The data on year structure built were obtained from answers to the American Community Survey, which was asked on a sample basis. Year structure built refers to when the building was first constructed, not when it was remodeled, added to, or converted. 

A household includes all of the people who occupy a housing unit. People not living in households are classified as living in group quarters. A housing unit is a house, an apartment, a mobile home, a group of rooms, or a single room occupied (or, if vacant, intended for occupancy) as separate living quarters. Separate living quarters are those in which the occupants live separately from any other people in the building and that have direct access from the outside of the building or through a common hall. The occupants may be a single family, one person living alone, two or more families living together, or any other group of related or unrelated people who share living quarters.

Since the 2010 US Census data, American Community Survey figures showed:

• Total households in Westchester County fell from 347,232 in 2010 to an estimated 345,885 as per the 2013-2017 ACS, a decrease of 0.4%.  The average household size rose from 2.65 in 2010 to the current estimate of 2.74, an increase of 3.4%.
• Married couple families in Westchester County increased from the 2010 US Census from 177,077 to 180,366, an increase of 1.8%.
• Total child population in Westchester County dropped from 228,000 to 199,970, a 12.3% decrease as compared with the 2010 US Census.