In-migration to the Birmingham market rose between 2017-18 and 2022-23

the Birmingham market · Data as of 2026-11-09 · ALEX Intelligence

Read this carefully: Only counties the IRS disclosed in both vintages, under the same FIPS code and above a minimum flow in each, are compared, because disclosure thresholds move between years and a flow that appears or vanishes at the margin is not evidence that anybody's behaviour changed. Connecticut is excluded throughout: its counties were replaced by planning regions, so no Connecticut geography is comparable across the change. The IRS withholds county-to-county flows below its disclosure threshold, so a county missing from this table is one whose flow was too small to publish, not one nobody moved from. Every total here is a total of disclosed flows and is therefore a floor.

Methodology

Source:

U.S. Internal Revenue Service, Statistics of Income Migration Data, county-to-county inflows, 2017-18 and 2022-23

Measure

Households (change against the earlier vintage), ranked highest first across every U.S. county the IRS recorded sending households to the Birmingham market (Bibb, Blount, Chilton, Jefferson, Shelby, St. Clair, Walker, AL) in both the 2017-18 and 2022-23 vintages (77 ranked in total).

How the headline figure is computed

Households arriving from the 77 counties the IRS disclosed in both the 2017-18 and 2022-23 vintages: 8,367 against 7,370. Counties disclosed in only one of the two vintages are excluded, because a flow crossing the disclosure threshold is not evidence of movement.

Universe

Every U.S. county the IRS disclosed a flow with. Counties whose flow fell below the IRS disclosure threshold are absent from the source file altogether, so this ranking is of disclosed flows and its totals are a floor rather than a complete count of movers.

Vintage

2023

Reproduce this query

https://www.irs.gov/pub/irs-soi/countyinflow2223.csv https://www.irs.gov/pub/irs-soi/countyinflow1718.csv

Every figure on this page is computed directly from the dataset named above by ALEX Intelligence. No figure on this page was written by hand or by a language model. The query is stated so that anyone can re-run it and obtain the same table.