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Cornell Program on Applied Demographics

Census 2020: What State and Local governments need to Know


Local Update Census Addresses (LUCA)

Local Update of Census Addresses (LUCA) Operation is a once–a-decade opportunity for local designated representatives to review the addresses that will be used to conduct the Decennial Census

2020 LUCA

A more expanded introduction of LUCA at the Census Bureau web site

Tentative schedule

January 2017 Advanced notice send out to Highest Elected Officials and other LUCA contacts.

In addition to the Advance Notice Letter, the LUCA information booklet, promotional participant workbooks and instructor guides, the Census Bureau will provide tools for potential LUCA partners at the Advance Notice stage. These tools will include an Address Count List for each GU, as well as a public geocoding tool. Potential LUCA partners can load their own residential address list into the Census Bureau’s geocoding tool to generate a count of residential addresses by block and compare it to the Census Bureau’s count of residential addresses by block. This will allow potential LUCA partners to see where the Census Bureau’s residential address count differs from their own and to assess their need to participate in the LUCA Operation. Address Count List are now availale at the Census Bureau LUCA web site

July 2017 Invitation and registration mailed to Highest Elected Officials (cc: other LUCA contacts)
  • LUCA information booklet
  • Confidentiality and Security Guidelines

Forms for Registration:

  • Registration Form
  • Confidentiality Agreement Form
  • Product Preference Form
  • Self-Assessment for the Confidentiality and Security Guidelines
October 2017LUCA Training Workshops begin
Between February 2018 and May 2018 Address review by the participants. Participants have a maximum of 120 days from the date of receipt of materials to complete and submit their address and spatial updates to the Census Bureau.
Between August 2019 and October 2019 The Census Bureau will provide a feedback package to governments that participate in the operation. There will be an opportunity to appeal the Census Bureau decisions.

Format of LUCA submissions

Address Updates
The information collection on living quarters address additions, corrections, deletions, and address attribute updates, at the participating government's preference, can be submitted in the form of:

  1. Digital data files output by the Geographic Update Partnership Software (GUPS), a desktop application supplied free-of-charge to LUCA participants to facilitate the review and update of Census Bureau address and map information;
  2. Digital data files formatted to Census Bureau specifications; or
  3. Handwritten annotations to printed-paper address listings and address locations on Census block maps (for governments with 6,000 or fewer addresses).

Feature Updates
The information collection on living quarters structure point coordinates, roads, and road attribute updates, at the participating government's preference, can be submitted in the form of:

  1. Digital data shapefiles output by GUPS;
  2. Digital updates to Census Bureau supplied shapefiles; or
  3. Handwritten annotations on Census Bureau supplied paper maps.

How to prepare for LUCA

  • Submit Contact Information Update Form
  • Develop a strategy for your address review
  • Access the Census Bureau’s count of residential addresses by census block for your government
  • Ensure that your address list contains individual multiunit structure identifiers (Apt 1, Apt 2)
  • Identify local address sources such as building permits, E-911 address files, local utility records, annexation records, and assessment or taxation files
  • Plan to attend a LUCA Promotional Workshop


Last modified: February 2, 2018