Medical Service Study Areas by Census Tract Detail 2000

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The dataset contains information on California’s Medical Service Study Areas (MSSA), at the census tract level for 2000. MSSAs are sub-city and sub-county geographical units used to organize and display population, demographic and physician data. MSSA areas are a geographic analysis unit defined by the California Office of Statewide Health Planning and Development. MSSA are a good foundation for needs assessment analysis, healthcare planning, and healthcare policy development.


Medical Service Study Areas (MSSAs) are sub-city and sub-county geographical units used to organize and display population, demographic and physician data. It helps to determine areas of unmet priority need for primary care family physicians and geographical rural areas where unmet priority need for medical services exist. MSSAs are recognized by the U.S. Health Resources and Services Administration, Bureau of Health Professions’ Office of Shortage Designation as rational service areas for purposes of designating Health Professional Shortage Areas (HPSAs), and Medically Underserved Areas and Medically Underserved Populations (MUAs/MUPs). The MSSAs incorporate the U.S. Census total population, socioeconomic and demographic data and are updated with each decadal census.

Office of Statewide Health Planning and Development provides updated data for each County’s MSSAs to the County and Communities. Each MSSA is composed of one or more complete census tracts. MSSAs will not cross county lines. All population centers within the MSSA are within 30 minutes travel time to the largest population center. Urban MSSA has Population range 75,000 to 125,000 and reflects recognized community and neighborhood boundaries. Rural MSSA has a population density of less than 250 persons per square mile and population center does not exceed 50,000. Frontier MSSA has a population density of less than 11 persons per square mile. The California Health and Human Services Agency coordinates the administration of state and federal programs for public health, health care services, social services, public assistance, health planning and licensing, and rehabilitation. These programs touch the lives of millions of California’s most needy and vulnerable residents. The Agency is responsible for balancing the twin imperatives of providing access to essential health and human services for California’s most disadvantaged and at-risk residents and managing and controlling costs.

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California Medical Service Study Areas


John Snow Labs; California Health and Human Services Agency (CHHS);

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Medical Service Study Subcity Areas, Medical Service Study Subcounty Areas, Medical Service Geographical Units, Medical Service Study Areas, California Health Professional Shortage Areas, Study Area Demographics, Primary Care Demographics, Healthcare Workforce, Rational Service Area, Population Geographical Units, Provider Ratio

Other Titles

California Medical Service Study Areas by Census Tract Detail 2000, California Medical Service Study Areas by Census Tract Population, Demographic and Physician Data 2000

Tract_IdentifierU.S. Census Tract Identifiernumberlevel : Ratio
County_FIPS_CodeCounty Federal Information Processing Standards FIPS Code - There are 58 unique codes for each California countyintegerlevel : Nominal
Tract_CodeU.S. Census Tract Code used in Composite Keyintegerlevel : Ratio
Census_KeyComposite Key - (U.S. Census State, County and Census Tract codes combined)integerlevel : Ratio
CountyName of countystring-
Tract_Identifier_2U.S. Census Tract Identifier2numberlevel : Ratio
Medical_Service_Study_Areas_IDMedical Service Study Area Identifierstring-
Medical_Service_Study_Areas_NameMedical Service Study Area Namestring-
Area_Square_MilesArea Square Miles for the MSSAnumberlevel : Ratio
Population_2000Total Population from American Community Surveyintegerlevel : Ratio
Civilian_Population_2000Civilian Population (population not living in institutions or group quarters)integerlevel : Ratio
Population_Below_100_Percent_Poverty_LevelCount of population living below the 100% federal poverty levelintegerlevel : Ratio
Percent_Population_Below_100_Percent_Poverty_LevelPercent of population living below the 100% federal poverty levelnumberlevel : Ratio
Population_Below_200_Percent_Poverty_LevelCount of population living below the 200% federal poverty levelintegerlevel : Ratio
Percent_Population_Below_200_Percent_Poverty_LevelPercentage of population living below the 200% federal poverty levelnumberlevel : Ratio
White_Population_CountWhite population countintegerlevel : Ratio
White_Population_PercentPercent of population identifying as White to total populationnumberlevel : Ratio
Black_Population_CountBlack population countintegerlevel : Ratio
Black_Population_PercentPercent of population identifying as Black to total populationnumberlevel : Ratio
Asian_Population_CountAsian population countintegerlevel : Ratio
Asian_Population_PercentPercent of population identifying as Asian to total populationnumberlevel : Ratio
American_Indian_Eskimo_CountAmerican Indian - Eskimo population countintegerlevel : Ratio
American_Indian_Eskimo_PercentPercent of population identifying as American Indian - Eskimo to total populationnumberlevel : Ratio
Islander_Population_CountIslander population countintegerlevel : Ratio
Islander_Population_PercentPercent of population identifying as Islander to total populationnumberlevel : Ratio
Other_Race_Population_CountOther Race population countintegerlevel : Ratio
Other_Race_Population_PercentPercent of population identifying as other racenumberlevel : Ratio
Multi_Race_Population_CountMulti Race population countintegerlevel : Ratio
Multi_Race_Population_PercentPercent of population identifying as Multi Racenumberlevel : Ratio
Hispanic_Population_CountHispanic population countintegerlevel : Ratio
Hispanic_Population_PercentPercentage of Hispanic of total populationnumberlevel : Ratio
Population_Aged_Under_5Population under Age 5integerlevel : Ratio
Population_Aged_Under_5_PercentPercent of population under Age 5 to total populationnumberlevel : Ratio
Population_Aged_Under_18Population under Age 18integerlevel : Ratio
Population_Aged_Under_18_PercentPercent of population under Age 18 to total populationnumberlevel : Ratio
Population_Aged_Between_18_And_64Population Age 18 - 64integerlevel : Ratio
Population_Aged_Between_18_And_64_PercentPercent of population Age 18 - 64 to total populationnumberlevel : Ratio
Population_Age_65_And_OverPopulation Age 65 and aboveintegerlevel : Ratio
Population_Age_65_And_Over_PercentPercent of population Age 65 and over to total populationnumberlevel : Ratio
Youth_RatioPopulation under Age 18 divided by the population Age 18 - 64numberlevel : Ratio
Elder_RatioPopulation Age 65 and over divided by the population Age 18 - 64numberlevel : Ratio
52.0210952026109005202Tuolumne52.02234.1Chinese Camp0.34500000000000000000000000000000000
777177006071007700San Bernardino77151kHighland/San Bernardino East3.08500000000000000000000000000000000
525.1859525186059052518Orange525.18116oIrvine Central/Tustin East2.13832000000000000000031000000133.3266.70000.5
5735375735006037573500Los Angeles573578.2lllBixby Knolls/Long Beach Central3.329100000110000000000000000000000110000
11479114006079011400San Luis Obispo114172San Luis Obispo0.56723181043.51878.32191.3000000000028.731300002191.328.70.10
9202379202006037920200Los Angeles920276.1aCanyon Country/Santa Clarita West/Saugus4.37500000000000000000000000000000000
3200373200006037320000Los Angeles320078.2jjSherman Oaks/Studio City/Valley Village0.48900000000000000000000000000000000