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residential sectors to aid in the delineation of the overall housing market area and, as necessary, the Santa Ana Submarket Area. This approach is consistent with FHA techniques of housing market analysis which advocates that the actual delineation of a housing market area and submarket areas be determined primarily by census area definitions. For practical purposes, the FHA guidelines recommend that Standard Metro- politan Statistical Areas be delineated as the housing market area in those cases where a SMSA has been established. In the case of Orange County, a SMSA has been established and the County is known as the Anaheim-Santa Arm- (]arden Grove SMSA. THE ORANGE COUNTY HOUSING MARKET AREA: The County lies along 40 miles of Southern California coast between Los Angeles and San Diego counties and extends some 25 miles inland. The market area covers nearly 800 square miles, three-fourths of which is privately owned. The eastern mountain range is largely uninhabited, and the population is mostly contained within the 342 square miles of incorporated cities in the northeast corner of the County, stretching south along the coast. Most of this urbanization has occurred on the relatively smooth lowland plain stretching northwesterly from the vicinity of Irvine, past Santa Aha, Garden Grove, and Buena Park into neighboring Los Angeles County. Hills and mountains bound this central lowland on the north, east, and south, while the Pacific Ocean limits the land to the south and southwest. Development in Orange County has followed a pattern uniform with the Southern California region. The 'rapidity with which it has occurred is the only variation. This pattern, established in Orange County during the major period of growth, 1950, 1970, ha~ been one of the development along major transportation networks. As minor networks are constructed, this develop- ment expands to the land between the highways. This pattern of d~velopment began in the early 1950s as a result of people seeking residence in Orange County while maintaining their place of work in Los Angeles County. '&naheiu~, (~'ran~Ke and Santa Ana incorporated between x'Bb~:ah~ 19~(~ As the first cities, they set a ti:eSa'£or c~.~t~ size Which was-bro'~em.~.~e before 1950. Statistics on city size reveal that rather than expand city boundaries by annexation, people immigrating into Orange County formed their own cities. This is shown by the fact that between 1900 and 1950 Orange County experienced 10 in'corporations, and that by 1950 only one city of the total 13 existing jurisdictions had appreciably expanded its boundaries. This was Santa Ana, which increased from 1.9 square miles to 10. 8. In fact, in 1950 only three of the County's cities were over five square miles in size and of these, Santa Aha was the only one that had expanded its boundaries since i~xcorporation. The next ten years from 1950 to 1960 brought about major changes in the land patterns of the County cities. The tremendous immigration into the County brought about nine 00008 .