Data on the Undercount

All Resources Data on the Undercount

Data on how many young children were missed, where they were, and what we know about them.

County-level Coverage Rates of Young Children in the 2020 Census: The National-Level Data Do Not Tell the Full Story

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Research and Communication Materials

Young Children and the Census

Data on the Undercount

County-level Coverage Rates of Young Children in the 2020 Census: The National-Level Data Do Not Tell the Full Story

| October 2023

This study extends a set of analyses that address one of the biggest problems in terms of the accuracy in… READ MORE

State Undercount Rates for Young Children in the 2020 Census

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Young Children and the Census

Data on the Undercount

State Data

State Undercount Rates for Young Children in the 2020 Census

Dr. William P. O'Hare| August 2023

Over the past decade there has been growing interest among researchers and Census stakeholders in the high and growing net… READ MORE

The Number of Hispanic Children in the Population Estimates Program Blended Base Compared to the 2020 Census Count

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Young Children and the Census

National Data

The Number of Hispanic Children in the Population Estimates Program Blended Base Compared to the 2020 Census Count

| March 2023

In the past few decades, the Census Bureau has produced yearly population estimates for states and counties including data for… READ MORE

Counties with High Undercounts of Children in the 2020 U.S. Census

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Research and Communication Materials

Young Children and the Census

Data on the Undercount

Local Data

Counties with High Undercounts of Children in the 2020 U.S. Census

| March 2023

The undercount of children in the U.S. Census is high and it has been growing. The undercount of children increased… READ MORE

The Number of Children in The Population Estimates Program Blended Base Used for Post-2020 Census Estimates Compared to the 2020 Census Count

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Young Children and the Census

Data on the Undercount

The Number of Children in The Population Estimates Program Blended Base Used for Post-2020 Census Estimates Compared to the 2020 Census Count

| December 2022

Since the 1970s, the Census Bureau has produced yearly population estimates for states and counties for the decade following each… READ MORE

Analysis of Unified School Districts and Places with Large Errors for the Population Ages 0 to 4 Caused by Application of Differential Privacy

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Young Children and the Census

Data on the Undercount

National Data

Analysis of Unified School Districts and Places with Large Errors for the Population Ages 0 to 4 Caused by Application of Differential Privacy

| September 2022

In my analysis of the DP Demonstration Product released by the Census Bureau on August 25, 2022 (O’Hare 2022) I… READ MORE

Data on the Undercount