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Medical Service Study Areas 2013

This file contains boundaries of Medical Service Study Areas (MSSA) provided to LA County by the California Office of Statewide Health Planning and Development (OSHPD).  The purpose of this designation is to identify areas of greatest need so that limited resources can be prioritized and directed to the people in those areas.

A MSSA is a Medically Underserved Area (MUA) or a geographic area with unusually high need when it meets one of the following criteria 1) 20% or more of the population per census tract living at or below 100% Federal Poverty Level (FPL) or 2) the youth ratio to adults per census tract is greater than .6 or 3) the elderly ratio (65 years and older) per census tract is greater than .25.

The Office of Shortage Designation (OSD) is responsible for developing and implementing criteria and procedures for designating areas and populations having a shortage of mental health services.

The MSSA boundaries follow the census tract boundaries and are updated every 10 ten years.  Based on the 2010 census tract boundaries there are approximately 100 MSSA boundaries in the County of Los Angeles.

To download the data, please click here.

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Data Field Descriptions

GIS Source Information
Database Name:
Feature Class Name:
Feature Dataset Name (if applicable):
Reference Date: 2010
Accuracy: Parcel
Update Frequency: Other
Access Constraints:None

Contact Information
Vandana Joshi
Mental Health Clinical Program Head
Los Angeles County
Mental Health


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