By on 8.2.21 in Census 2020, Elections & Voting, NC in Focus

This is the second post in a three-part series previewing redistricting in North Carolina. Other posts provide an overview of redistricting and a preview of what redistricting means for NC’s Senate.

Typically, redistricting starts in April, but the data delays because of Covid-19 pushed back the redistricting data release to August. Redistricting data from the 2020 census will be released on Aug. 12 at 1 p.m. ET. The redistricting files are expected to be uploaded to the Census Bureau’s FTP site.

When that happens, North Carolina legislators will begin the process of redrawing the state’s 14 Congressional districts, 50 state senate districts, and 120 state house districts.

In North Carolina, the redistricting process for the General Assembly is now partially determined by an algorithm that helps to ensure that districts align with county boundaries as much as possible. During the early summer of 2021, we worked with a team of researchers from across the state to understand the potential impacts of population change on state-level redistricting. (Learn more about the team and our approach.) In this post, we break down what might happen in North Carolina’s House.

Remember! The data presented here are based on estimates of population change over the decade based on trends in births, deaths, and migration. These estimates have a margin of error and are not the same as the 2020 Census. We are using this data to give us insights into what we might expect when the first local Census results are released in mid-August.

Key takeaways:

  • The “ideal district size” for NC House seats will be 86,995 and can range between 82,645 and 91,345.
  • Wake and Mecklenburg may gain seats.
  • The greatest volatility in potential clusters is in areas with generally declining or slower-growing populations.
  • The 2020 Census numbers will be different than the estimates presented here; these differences, even if small, could have a large impact on the political map.

How many seats are in North Carolina’s House?

There are 120 seats in North Carolina’s House.

What is the “ideal district size”?

The ideal district size is equal to the state’s resident population (10,439,388) divided by 120 or 86,995. During the redistricting process, the population of a district can range within 5% of this ideal size, meaning districts can range from 82,645 to 91,345.

What are potential changes/implications?

We evaluated the legislative county clusters identified under the 2010 Census and under four sets of estimates for the 2020 population of each county (full methodology). In total, the four sets of estimates produced 26 potential county cluster maps.

Which counties may be gaining seats?

Estimates of growth over the decade suggest that our two largest counties could pick up representation in the NC House after the release of the 2020 Census:

  • Wake shifts from either 11 to 12 or 13 seats under the estimates evaluated
  • Mecklenburg could shift from 12 to 13 seats

Wake and Mecklenburg’s gain reflects their large population growth over the decade. For example, as of 2019, the Census Bureau estimated that Mecklenburg had grown by 190K new residents and Wake had gained 211K, more than enough to gain at least one seat in the state house.

Which new clusters are likely to emerge in the 2020 redistricting process?

There were three county clusters that are not in the current NC House map but emerged in all four of the estimates evaluated:

  • Pitt (2 districts)
  • Durham-Person (4)
  • Haywood-Madison (1)

These changes would have implications for counties that previously were previously clustered with the counties listed above. For example, a Durham-Person cluster would impact Chatham County, which would be sharing portions of a seat with a different county. Potential counties paired with Chatham varied by the estimate evaluated and included Harnett, Lee, Moore, Randolph, and Richmond.

Which county clusters may be unchanged in the 2020 redistricting process?

There were seven county clusters that are in the current map (based on 2010 Census) and were also present in all four estimates models. These include the three single district clusters of Lincoln County; Hoke and Scotland counties; and Cherokee, Clay, Graham, and Macon counties. If these clusters remain in the clusters identified with the 2020 Census data, these districts will be unchanged.

Four multi-district clusters on the current map were also present under all estimates evaluated:

  • Alamance (2 districts)
  • Davidson (2)
  • Buncombe (3)
  • Guilford (6)

While these clusters may be unchanged, the specific district boundaries that are drawn within them will need to be redrawn to account for shifts in population within the county over the decade.

Where is the greatest uncertainty?

There is a lot of volatility in the clusters produced across the different population estimates that we evaluated as we tried to understand what to expect with the release of the 2020 Census. Notably, in the NC House map, the instability was greatest in areas that have experienced population declines, though not entirely concentrated there. Regions with the greatest instability included the northeast, southeast (Onslow to Sampson/Duplin), the northwest, and the sandhills. For example, the image below highlights the four potential county clusters identified using the 2020 population data from the state demographer at the Office of State Budget and Management.

four potential county clusters

What do we not know?

While these data can help us understand what we might expect when the 2020 Census data is released in the next few weeks, we are still waiting for the official Census numbers. These should be released by August 16, 2021.

This process can be confusing. Even once we have the Census numbers, there may be multiple county clusterings that are identified, meaning that there will be decisions about which counties should be clustered together for the purposes of redistricting. Once the county clusters have been selected, the redistricting process fully begins, as there are often multiple districts within the county clusters. In these instances, there are many potential ways to draw the corresponding lines, and there is less explicit guidance than what exists for identifying potential clusters.

How can I learn more?

We will be writing a series of posts and explainers about redistricting in the coming days and will disseminate additional information through our newsletter. You can sign up on the top right-hand side of this page.

If you have questions about redistricting, let us know and we will do our best to answer.

August 5: The Census Bureau is holding an informational webinar in advance of the redistricting data release on Thursday, August 5 at 1 p.m. EDT.

August 11: The NC Office of State Budget and Management is hosting a virtual event to discuss how and where to get the data and the legal foundation of redistricting.

Additional analysis and commentary can be found at:


Republish our content for free under a Creative Commons license.

Need help understanding population change and its impacts on your community or business? Carolina Demography offers demographic research tailored to your needs.

Contact us today for a free initial consultation.

Contact Us

Categories: Census 2020, Elections & Voting, NC in Focus

Featured projects

Your support is critical to our mission of measuring, understanding, and predicting population change and its impact. Donate to Carolina Demography today.