By Mario Reyna
How the Office of Management and Budget designates Metropolitan Statistical Areas in the RGV is not a political process — it is a purely data-driven, administrative determination based on observable population behavior.
The Core Trigger
When commuting data shows that 25% or more of a county's working population commutes to a neighboring county, OMB merges both into a single Metropolitan Statistical Area. The logic is straightforward: if a quarter of your residents cross the county line daily for work, the two counties function as one integrated labor market and are measured as such.
The Process
OMB periodically reviews Census Bureau and American Community Survey traffic and commuting pattern data. It identifies counties where 25% or more of the working population commutes to a neighboring county and merges those counties into a single MSA designation. The anchor county must have an urbanized area of at least 50,000 people to qualify as an MSA. No elected officials, lobbying, or political decisions influence the outcome — the data either meets the threshold or it doesn't.
The Rio Grande Valley Designations
The four RGV counties each carry distinct designations based on what the commuting data showed:
Hidalgo County anchors the McAllen–Edinburg–Mission Metropolitan Statistical Area**. With nearly one million residents, Hidalgo is the core of the region's largest labor market and fully meets the MSA population and commuting thresholds.
Cameron Count anchors the Brownsville–Harlingen Metropolitan Statistical Area. Cameron stands alone as a full MSA, with Brownsville and Harlingen as its principal cities.
Starr County does not meet the 25% commuting threshold into Hidalgo County to be folded into the McAllen MSA. Instead, Starr carries its own designation as the Rio Grande City Micropolitan Statistical Area — a smaller classification for urbanized areas between 10,000 and 49,999 people.
Willacy County similarly stands apart from Cameron County's MSA. Willacy carries its own designation as the Raymondville Micropolitan Statistical Area, anchored by Raymondville as its principal city.
How They Connect at the Regional Level
While Starr and Willacy do not merge into their neighboring MSAs, they are not isolated. OMB uses a second-tier designation — the Combined Statistical Area (CSA) — for adjacent areas that show meaningful but lower-level economic integration, measured at a 15% employment interchange rate rather than 25%.
All four RGV counties connect under two CSAs:
The McAllen–Edinburg–Mission–Rio Grande City CSA links Hidalgo County's MSA with Starr County's Micropolitan Area at the 15% threshold.
The Brownsville–Harlingen–Raymondville CSA links Cameron County's MSA with Willacy County's Micropolitan Area at the 15% threshold.
The Bottom Line
The RGV is not one MSA — it is two MSAs, two Micropolitan Areas, and two CSAs, all shaped exclusively by where people go to work every day. The commuting data drove every designation. Not politics. Not lobbying. Not regional preference. The numbers decided it.
Editor’s Note: The above commentary was penned by Mario Reyna, executive director of RioPlex.
