U.S. flag

An official website of the United States government

Skip Header

Local Update of Census Addresses (LUCA) Operation

LUCA is the only opportunity offered to tribal, state, and local governments to review and comment on the U.S. Census Bureau's residential address list for their jurisdiction prior to the 2020 Census. The Census Bureau relies on a complete and accurate address list to reach every living quarters and associated population for inclusion in the census. The Census Address List Improvement Act of 1994 (Public Law 103-430) authorizes the LUCA.

LUCA Closeout is under way for participants who did not file an appeal with the LUCA Appeals Office. To close out your government’s participation in LUCA, please fill out and sign the D-2012, Destruction or Return of Title 13 Materials Form, and return it to the Census Bureau by mail or email. Governments who filed appeals should wait to destroy or return their materials and send a D-2012 form after they receive a determination letter from the LUCA Appeals Office. See the “What are the LUCA Closeout Phase Materials?” section below for more information.

Who Can Participate?

Active, functioning governments were eligible to participate in LUCA for areas including:

  • Federally recognized tribes with a reservation or off-reservation trust lands;
  • States;
  • Counties;
  • Cities (incorporated place); and
  • Townships (minor civil divisions).

If governments lacked the resources to participate in LUCA, they were able to arrange for a higher level of government, such as county, or an organization, such as regional planning agency or council of governments, to conduct their review.

To see which governments sent LUCA responses, view the LUCA Respondent Viewer map.

Why Participate?

  • Governments that participated in LUCA help ensure an accurate decennial census count for their communities.
  • An accurate count helps the federal government annually allocate more than $675 billion across 26 federal agencies for tribal, state, and local government programs and services.
  • To help communities plan for future needs.

What is the LUCA Schedule?

The LUCA schedule spans from January 2017 to September of 2019, with closeout efforts occurring through June 2020:

  • January 2017: Advance notification of the LUCA operation mailed to the Tribal Chairs, Governors, Highest Elected Official (HEO) or Appointed Official of all eligible governments, regional agencies and former LUCA contacts.
  • March 2017: LUCA promotional workshops began.
  • July 2017: Invitation letter and registration forms mailed to the Tribal Chairs or HEO of all eligible governments with courtesy copies to pre-identified potential LUCA liaisons/contacts.
  • October 2017: LUCA training workshops began. Self training aids and webinars were available on the 2020 LUCA website.
  • February-April 2018: Review Phase materials delivered to registered participants. Participants had 120 calendar days from date of receipt to review, update, and return their materials to the Census Bureau.
  • February-September 2018: LUCA submissions processed.
  • July-September 2019: Feedback Phase materials provided to participants.
  • October 2019-June 2020: Conduct LUCA closeout.
  • April 1, 2020:  Census Day.

What are the LUCA Closeout Phase Materials?

After the conclusion of the LUCA Feedback Phase, including receiving a final determination from the LUCA Appeals Office for those governments who choose to file an appeal, LUCA participants must destroy (preferred method) or return to the Census Bureau all of their Title 13 protected materials. 

LUCA Liaisons must certify the destruction (preferred method) or return of all Title 13 materials on the D-2012, which they must complete, sign, and return to the Census Bureau. If people who signed the D-2005, Confidentiality Agreement Form, are no longer available to sign out on a D-2012 form, the LUCA Liaison may sign out on their behalf in Section A of the form. If the LUCA Liaison is no longer available, the Highest Elected Official (HEO) may sign Section A of the D-2012 form to certify that their government no longer has any Title 13 protected materials.

To return a completed D-2012 form to the Census Bureau, mail the form to the Census Bureau using the prepaid envelope included in the Feedback or Review Phase packages, or in another envelope using this address:

National Processing Center
1201 E. 10th Street
Jeffersonville, IN 47123

Or, scan and email it to the Census Bureau at geo.2020.luca@census.gov.

LUCA Address Count List

The 2020 Census LUCA Address Count List files remain available for download and reference from our secure file transfer protocol (SFTP) site. They were last updated in January 2018. These files are comma delimited (CSV) and contain 13 fields of information.

To download files, please select American Indian Areas, a state, the District of Columbia (DC), or Puerto Rico (PR) from the menu below. After making your selection, click on the folder of your entity type (county, place, or mcd for Minor Civil Divisions). You may also use the Address Block Count List Locator file to determine the folder where your entity's Address Count List file is stored.

What are the LUCA Feedback Phase Materials?

The following PDF documents were part of the stateside LUCA Feedback Phase materials sent to participants based on the final format of products provided for the Review Phase materials. They are available for reference.

For governments who did not opt out of Feedback, the Census Bureau generated Feedback materials based on the results of processing submissions received during the LUCA Review Phase.


Below are the review materials developed for Puerto Rico participants. Materials with an “(SP)” as part of their form number are translated into Spanish. They are available for reference.  Because the GUPS software is in English, the GUPS materials are not translated.

Training Webinar Information

This video provided LUCA participants instructions on how to use the Census Bureau’s Geographic Update Partnership Software to load their Feedback Address List and Feedback Address Count Lists, review appeal-eligible records, and prepare their submission for the Appeals Office. The video concluded by showing participants how to upload their submission using the Secure Web Incoming Module.

What are the original LUCA Review Phase Materials?

The following PDF documents are part of the stateside LUCA Review Phase materials sent to participants based on product selection during registration. They are available for reference:

Legal Values Document

Sample Map Products


Below are the original LUCA Review Phase materials developed for Puerto Rico participants for reference. Materials with an “(SP)” as part of their form number are translated into Spanish. Because the GUPS software is in English, the GUPS materials are not translated.

What If I Have Questions?

If you have questions regarding LUCA Feedback, call us at 1-844-344-0169 or email us at geo.2020.luca@census.gov. Our LUCA Help Desk staff is available from 8:00 a.m. to 8:00 p.m. Eastern Time. You may leave a message after hours and we will return your call within two business days. The Help Desk staff can assist you with any questions you may have concerning LUCA.

If you have questions regarding LUCA Appeals, call the LUCA Appeals Office at 1-888-222-9907 or email them at INFO@LUCA-Appeals.gov. The Appeals Office Help Desk staff is available from 8:00 a.m. to 8:00 p.m. Eastern Time.

Page Last Revised - September 29, 2023
Is this page helpful?
Thumbs Up Image Yes Thumbs Down Image No
255 characters maximum 255 characters maximum reached
Thank you for your feedback.
Comments or suggestions?


Back to Header