Flight attendants concentrate 82.6 per cent of their metro employment in ten metros and appear in only twenty of the 393 surveyed. Airline pilots follow at 72.7 per cent, art directors at 64 per cent, web and digital designers at 62 per cent. At the other end, water and wastewater treatment operators appear in 367 metros with just 21.5 per cent in the top ten.
Two ends of the same measure
Flight attendants put 82.6 per cent of their metro employment into ten metros, and appear in only twenty of the 393 surveyed. Airline pilots follow at 72.7 per cent, art directors at 64, web and digital designers at 62.
At the other end, water and wastewater treatment operators appear in 367 metros with 21.5 per cent in the top ten. Welders are in 382. Institutional cooks and parts salespersons are in 391 — which is to say very nearly everywhere the survey looks.
Why some work clusters
Every heavily concentrated occupation depends on a small number of very large fixed things. Aviation crew follow hub airports, and there are only so many hubs. Creative direction follows the client industries that buy it. Biochemists follow research institutions and the funding attached to them.
None of that moves easily. You cannot start a hub, and the work goes where the asset already is. That is what makes these occupations geographically rigid in a way that has nothing to do with the skill itself.
Why some work is everywhere
Because it serves local populations and local infrastructure. Every town treats its water, feeds people, fixes machinery and sells parts. The demand is distributed because the people are distributed.
That is a form of security nobody counts as one. An occupation present in 391 metros cannot be stranded by one city’s downturn, and you can move for reasons that have nothing to do with work and still find work.
What each pattern costs and pays
Concentrated: geography is a constraint. You go where the work is, competition is intense because everyone else went there too, and pay is usually higher. A bad local market means relocating rather than switching employers, and that is an expensive kind of job search.
Spread: geography is a choice. Pay is flatter across places and ceilings are lower, but you can optimize for cost of living, family, weather or anything else, because the work follows you. Over a career that option has real value that never appears in a salary comparison.
The mistake in the middle
Plenty of occupations sit between the two and get misread as concentrated because their best-known employers are famous. Software developers are not a clustered occupation in the sense flight attendants are: they appear across hundreds of metros, and the clustering is in the pay rather than the presence.
Check both. Number of metros tells you whether the work exists elsewhere; concentration tells you where it is dense. An occupation can be widely available and still pay properly in only a handful of places, and that combination calls for a different plan than either extreme.
The measurement trap worth knowing
An occupation appearing in very few metros is not necessarily clustered — it may be mostly outside metropolitan areas altogether. Locomotive engineers turn up in three metros, which reflects where the survey sees them rather than a cluster.
About a sixth of US employment sits outside metro areas entirely: 130 million of roughly 155 million jobs are inside the 393 surveyed. Any geographic claim about your occupation has to allow for that, and it is the single most common error in this kind of analysis.
Checking your own
Two numbers: how many metros report your occupation, and what share of its metro employment sits in the top ten. Together they tell you whether moving is a lever you have, or whether the map has already decided for you.
What clustering does to a career, not just a job search
In a concentrated occupation your employer options are geographic before they are anything else. That shapes decisions years out: whether you can take a family consideration seriously, whether a partner’s promotion in another city is survivable, whether you can afford to leave a bad manager without also leaving your house.
People in spread occupations underestimate how much this constrains everyone else. People in clustered occupations underestimate how much of their salary premium is compensation for it. The two groups give each other career advice constantly and it rarely transfers.
The practical version: if your occupation lives in twenty metros, treat every move as a move between a small number of known markets and keep relationships in more than one of them. If it lives in 391, treat geography as a variable you control and optimize it for the rest of your life rather than for the job.
Clustering changes over time, slowly
These patterns move, but on the timescale of the assets underneath them. A hub closing or a research cluster forming rearranges an occupation’s map over a decade or two, not a year.
So current concentration is a reliable planning input, which is unusual for labor market data. Most labor market figures are revised annually. Where a specific occupation physically sits is one of the few things you can reasonably assume will look similar when you next think about it.
Common questions
Which occupations are most geographically concentrated?
Flight attendants at 82.6 per cent in ten metros, airline pilots at 72.7, art directors at 64 and web designers at 62.
Which are most evenly spread?
Water treatment operators in 367 metros, welders in 382, institutional cooks and parts salespersons in 391.
Why do some occupations cluster?
They depend on a small number of large fixed assets or institutions — hub airports, studio systems, research clusters.
What does a spread occupation give you?
Geography as a choice. Flatter pay across places and lower ceilings, but the work follows you wherever you want to live.
What is the measurement trap?
Few metros can mean mostly nonmetro rather than concentrated. About a sixth of US employment sits outside metro areas.
Which occupations exist almost everywhere?
Water and wastewater treatment operators appear in 367 metros, welders in 382, and institutional cooks and parts salespersons in 391 of the 393 surveyed.
Does appearing in few metros mean an occupation is clustered?
Not necessarily. Locomotive engineers show up in three metros because they are largely nonmetro, and about a sixth of US employment sits outside metro areas.