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Analyzing New Jersey’s Adjusted Redistricting Data

Used for US congressional and state legislative redistricting

Full Report

The expanded report provides a detailed breakdown of the PL 94-171 data as released by the Census Bureau, compared to the reallocated, or adjusted data, provided by the state’s official redistricting body.

Specifically, this report details the differences in total population by census block, block group, tract, county, and state before and after reallocation. In states where comparisons are possible, these population differences are broken down by race and ethnicity.



New Jersey uses adjusted (or modified) data for US congressional and state legislative redistricting.

  • 9,288,994 total population in the original PL file
  • 9,283,016 total population in the adjusted PL file
  • -5,978 total population difference between the two

Even in states where where the total population is unchanged, the distribution of population within the state can be affected.

To give you a sense for how these population shifts affect New Jersey’s redistricting, the average district sizes in New Jersey are:

  • 232,075 people per state House district
  • 232,075 people per state Senate district
  • 773,584 people per Congressional district

The dataset used to create this report is the official redistricting dataset.

County Level Analysis

See the appendix for a detailed breakdown of county level population changes.

New Jersey's Adjusted Data Population Changes by County with Facility Locations

Block Level Analysis

In general, the changes in block population are not uniform: most blocks are unaffected by modification, while a handful of blocks lose a large amount of population that goes to a larger number of blocks in smaller quantities.

  • 137,972 census blocks in New Jersey
  • 127,510 census blocks have the same population following modification
  • 10,419 census blocks gained population following modification
  • 43 census blocks lost population following modification (Of the 43 census blocks that lost population following reallocation, 34 contained facilities according to our analysis conducted with PPI data.)
  • 7 census blocks have a negative population following modification.
Population Change Number of Blocks
Gained 100+ 0
Gained 51-100 0
Gained 11-50 22
Gained 6-10 163
Gained 1-5 10,234
No Change 127,510
Lost 1-5 10
Lost 6-10 6
Lost 11-50 4
Lost 51-100 1
Lost 100+ 22

Official Language

The official language for New Jersey’s adjustment is:

Pursuant to P.L.2019, c.385 (C.52:4-1.1 et seq.), the New Jersey Secretary of State is required to reallocate the population of certain incarcerated persons to their last known residential address for legislative redistricting purposes. Pursuant to section 1 of P.L.2021, c.198 (C.52:4-1.6), the State’s congressional districts must also be drawn using this adjusted data. The congressional districts must meet equal population requirements under both adjusted and non-adjusted data sets, to the greatest extent possible.


County Population Change
Camden 1,514
Passaic 1,346
Union 1,115
Hudson 1,033
Atlantic 997
Monmouth 840
Ocean 557
Bergen 468
Gloucester 376
Somerset 280
Cape May 255
Morris 194
Salem 150
Sussex 112
Warren 84
Essex -307
Middlesex -552
Hunterdon -1,048
Mercer -1,704
Burlington -4,630
Cumberland -7,058