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Taxation System . Other branches include the Offices of the Registrar- Recorder, Auditor- Controller, and Treasurer-Tax Collector. The Assessor's responsibilities include serving the public , locating and identifying ownership, establishing values, completing an assessment roll , and applying all legal exemptions . Under the County Assessor's Office is the Assessor's • Mapping Services Section . For decades , the ownership and property tax data sets were recorded on thousands of paper maps . These maps span Los Angeles County, which is the most populous county in the nation and is larger in population than 42 states in the United States . Los Angeles County's approximately 9 .9 million residents live within its 4,083 square miles , making it one of the largest counties in terms of area as well . In the past, property and tax maps were only ' available to citizens who visited the Assessor's offices and made requests for hard-copy information . The Assessor's Mapping Services Section began automating its map- making and editing efforts with GIS in the late 1980s . Through the years, the organization grew and matured as a GIS site, and in 1997, Mapping Services acquired ArclMS with the goal of providing data more easily to the public via the Internet. "We wanted to provide a service to constituents that made parcel and property value information available so y - that they, in turn , could make informed decisions ," says Richard N . Quacquarini , chief cadastral engineer, Office of Los Angeles County Assessor's Mapping Services Section . "We wanted something that was intuitive and very user friendly and provided the targeted functionality whether a user has a slower dial-up • connection or a faster broadband + connection : ' Also integral to their two system configurations are ArcGIS , ArcSDE, and ArcView 3 .2 ; one ' system is on-site providing production needs , and the other is off-site providing Web applications . The Assessor's system is called the Property Assessment Information System ( PAIS) . Users access PAIS through a standard Web browser to research assessment information - for individual parcels , print Assessor's maps , ` and search for sales within the past two ears . Users can o0 y pan and zoom and view indexed parcel information including property values, parcel numbers , sales data , and more . Whether running a query based on a parcel number, address , or street . . . intersection or merely panning and .. zooming around a map , users can quickly access linked Assessor's information via 167 GIS Needs Assessment and Implementation Plan Chapter 1 - Departmental GIS Needs Assessment