Suffolk County MA Information


Suffolk County Subdivisions

Suffolk County MA Data & Demographics (As of July 1, 2021)


Total Population 808,831 (100%)
Population in Households 757,854 (93.7%)
Population in Families 483,364 (59.8%)
Population in Group Quarters1 50,977 ( 6.3%)
Population Density 13,908
Diversity Index2 79


Median Household Income $77,164
Average Household Income $113,369
% of Income for Mortgage4 33%
Per Capita Income $46,037
Wealth Index5 94


Total HU (Housing Units) 348,666 (100%)
Owner Occupied HU 120,437 (34.5%)
Renter Occupied HU 205,592 (59.0%)
Vacant Housing Units 22,637 ( 6.5%)
Median Home Value $606,052
Average Home Value $741,299
Housing Affordability Index3 72


Total Households 326,029
Average Household Size 2.32
Family Households 154,478
Average Family Size 3
  1. Group Quarters - a place where people live or stay in a group living arrangement. Includes college residents halls, nursing facilities, military barracks, and correctional facilities.
  2. 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 races 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.
  3. The Housing Affordability Index base is 100 and represents a balance point where a resident with a median household income can normally qualify to purchase a median price home. Values above 100 indicate increased affordability, while values below 100 indicate decreased affordability.
  4. The % of Income for Mortgage quantifies the percentage of median household income dedicated to mortgage payments on a home priced at the median value (assuming a 30-year mortgage and a 20% down payment).
  5. The Wealth Index is based on a number of indicators of affluence including average household income and average net worth, but it also includes the value of material possessions and resources. It represents the wealth of the area relative to the national level. Values above or below 100 represent above-average wealth or below-average wealth compared to the national level.


2010-2021 2021-2026
Population 1.01% 1.01%
Households 0.96% 1.06%
Families 0.85% 1.01%
Median Household Income   2.81%
Per Capita Income   2.67%
Owner Occupied HU   1.31%


Suffolk County MA - Peer Comparisons by Rank and Percentile

The table below compares Suffolk County to the other 14 counties and county equivalents in Massachusetts by rank and percentile using July 1, 2021 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 # 3 86th
Population Density # 1 100th
Median Household Income # 9 43rd
Housing Affordability Index # 3 21st
Per Capita Income # 6 64th
Diversity Index # 1 100th

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

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