The counties sending Boulder County its highest-earning arrivals

Boulder County · Data as of 2026-09-19 · ALEX Intelligence

Read this carefully: 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, 2022-23

Measure

Average income of arriving households, ranked highest first across every U.S. county the IRS recorded sending households to Boulder County (Boulder, Broomfield, CO) (31 ranked in total).

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

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.