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Local Update of Census Addresses Operation (LUCA)

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LUCA was 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.

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Who Participated?

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.

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Why Participate?

  • Governments that participated in LUCA help ensure an accurate decennial census count for their communities.
  • An accurate count helped 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.

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What is the LUCA Schedule?

  • January 2017:  Advance notification of LUCA mailed to the Tribal Chairpersons (TCs) and highest elected officials (HEOs) of all eligible governments and other LUCA contacts.
  • March 2017:  LUCA promotional workshops began.
  • July 2017:  Invitation letter and registration forms mailed to the TC or HEO of all eligible governments.
  • October 2017:  Training workshops began. Self-training aids and Webinars were made available online at the LUCA website.
  • December 2017:  Deadline to register for LUCA.
  • January 31, 2018:  Registration deadline for those areas impacted by the 2017 natural disasters.
  • February 2018:  Participation materials mailed to registered participants.
  • June 1, 2018:  The Census Bureau deadline for stateside LUCA material change requests and replacement files.
  • July - August 2019:  Feedback materials offered to participants after Census Bureau processing of LUCA Review updates.
  • April 1, 2020:  Census Day.

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What are the LUCA Feedback Phase Materials?

The following PDF documents are 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 generates Feedback materials based on the results of processing submissions received during the LUCA Review Phase.

LUCA Feedback Phase Quick Start Guides

pdf   D-2240: Digital   [<1.0 MB]
pdf   D-2241: Paper   [<1.0 MB]
pdf   D-2242: GUPS   [<1.0 MB]

LUCA Feedback Phase Respondent Guides

pdf   D-2231: Paper   [<1.0 MB]
pdf   D-2232: Digital   [<1.0 MB]
pdf   D-2233: GUPS   [<1.0 MB]
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Below are the review 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.

LUCA Feedback Phase Quick Start Guides

LUCA Feedback Phase Respondent Guides

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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. Anyone who swore to uphold Title 13 with his/her signature on the D-2005 Confidentiality Agreement form must sign out of the LUCA operation on the D-2012. If people who signed the D-2005 are no longer available to sign out on a D-2012, the LUCA Liaison may sign out on their behalf.

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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:

LUCA Review Phase Quick Start Guides

pdf   D-2040: Digital   [<1.0 MB]
pdf   D-2041: Paper   [<1.0 MB]
pdf   D-2042: GUPS   [<1.0 MB]

LUCA Review Phase Respondent Guides

The following materials are necessary reference materials, as content included within them does not repeat in the Feedback Respondent Guides.

pdf   D-2031: Paper   [<1.0 MB]
pdf   D-2032: Digital   [<1.0 MB]
pdf   D-2033: GUPS   [<1.0 MB]

Legal Values Document

Sample Map Products

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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.

LUCA Review Phase Quick Start Guides

LUCA Review Phase Respondent Guides

Legal Values Document

Sample Map Products

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Training Webinar Information

A LUCA Feedback demonstration is available below. This video provides 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 concludes by showing participants how to upload their submission using the Secure Web Incoming Module.

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LUCA Address Count List

The 2020 Census LUCA Address Count List files are available for download and reference from our secure file transfer protocol (SFTP) site. 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.

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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 Feedback.

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 available from 8:00 a.m. to 8:00 p.m. Eastern Time.

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