The Local Update of Census Addresses program, also known as LUCA, is a decennial census geographic partnership program that allows designated representatives of tribal, state, and local governments to review and update the Census Bureau's Address List that is used to deliver questionnaires for the decennial census. The LUCA program uses local knowledge to update the Census Bureau's Address List and maps. It is authorized by the Census Address List Improvement Act of 1994

Why are we doing LUCA?
Because the objective of the census is to collect a questionnaire from every address on the Census Bureau's Address List, the accuracy and completeness of the address list is critical to the accuracy and completeness of the census. Therefore, governments that participate in the LUCA Program help ensure an accurate decennial census for their communities.

How was GIS used?
GIS was initially used to establish new or unaccounted address ranges missing from the Census Master Address File. GIS was also crucial during the challenge aspect of rejected address ranges and the establishment of new construction between the initial date and the start of the Census in April.

Why is LUCA important?
There are a number of reasons accurate census data are important to you. Census data are used not only to apportion seats in the House of Representatives but are used to appropriate federal monies in over 1000 programs administered by 26 federal agencies. Most of the funds for these programs are distributed by formulas that use census data such as total population, population by age group, gender, income, housing characteristics, etc. depending on the program. For instance, according to the U.S. Government Accountability Office (GAO) Report to Congressional Requesters, published in June 2006, the top 20 federal formula grant programs together had over $300 billion in obligations to states of the total $460.2 billion obligated by over 1,100 federal grant programs in fiscal year 2004.

Census data also provides the statistical support for grant applications that fund community social, economic, and environmental programs as well as other needed community improvements and enhancements.

Census data helps your community to plan for future needs. For example, if census data reveals that your community has a growing number of individuals nearing retirement age, you may have a future need for more assisted living options.