Onset, MA Profile: Facts & Data


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Onset, Massachusetts - Basic Facts

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The Onset CDP(1) had a population of 1,660 as of July 1, 2021. Onset ranks in the upper quartile for Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in Massachusetts. See peer rankings below.

The primary coordinate point for Onset is located at latitude 41.7418 and longitude -70.6578 in Plymouth County. The formal boundaries for the Onset Census Designated Place encompass a land area of 1.08 sq. miles and a water area of 0.22 sq. miles. Plymouth County is in the Eastern time zone (GMT -5). The elevation is 13 feet.

The Onset Census Designated Place has a U1 Census Class Code which indicates a census designated place with an official federally recognized name. It also has a Functional Status Code of "S" which identifies a statistical entity.

The Onset Census Designated Place is located within Town of Wareham, a minor civil division (MCD) of Plymouth County.

  1. A Census Designated Place (CDP) is a statistical counterpart to a self-governing (incorporated) place such as a city, town, or village. A CDP is not a legal entity and has no governmental functions.

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  1. Onset 2021 Demographic Data
  2. Growth Rates for Onset (Historical & 5-Year Forecast)
  3. Peer Comparisons (Rank and Percentile)
  1. Neighborhoods Demographics (Home Values, Household Income, etc.)
  2. Massachusetts Research Tools (Easy Tools & Current Data)
  3. Massachusetts Data Comparison Tool - 2021 Demographics

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


Total Population 1,660 (100%)
Population in Households 1,660 (100.0%)
Population in Families 1,188 (71.6%)
Population in Group Quarters1 0
Population Density 1,540
Diversity Index2 66


Median Household Income $35,000
Average Household Income $60,127
% of Income for Mortgage4 37%
Per Capita Income $27,600
Wealth Index5 56


Total HU (Housing Units) 1,314 (100%)
Owner Occupied HU 466 (35.5%)
Renter Occupied HU 296 (22.5%)
Vacant Housing Units 552 (42.0%)
Median Home Value $308,407
Average Home Value $306,384
Housing Affordability Index3 60


Total Households 762
Average Household Size 2.18
Family Households 408
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 0.48% 0.49%
Households 0.51% 0.47%
Families 0.4% 0.44%
Median Household Income   2.67%
Per Capita Income   2.69%
Owner Occupied HU   1.09%

Onset, MA - Peer Comparisons by Rank and Percentile

The table below compares Onset to the other 245 incorporated cities, towns and CDPs 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 # 202 18th
Population Density # 114 54th
Median Household Income # 245 0th
Housing Affordability Index # 12 5th
Per Capita Income # 223 9th
Diversity Index # 24 91st

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

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