Southwestern Ontario (SWO)

Southwestern Ontario (SWO): the places inside it, the companies based here, and where this atlas has research on it.

area · North America · page prepared 2026-11-07

Visiting rather than moving? The free guidebook for SWO →

A

SWO at a glance

Rolled up from the 14 regions inside SWO on this site.

Population—
registry estimate
Places inside14
5 with a full /local page
Businesses on file17,369
business register, all places inside
Companies headquartered260
in the company directory
Who represents them5
places with a /politics page
Property & employers2 · 2
/property and /employers records
E

Largest employers headquartered in SWO

Worldwide head offices from the /employers research, ranked by people employed as each company reports it.

  1. 1.GoodLife Fitness London, ON · Fitness clubs ↗13,000 worldwide
  2. 2.Digital Extremes London, ON · Video game development ↗450 worldwide
  3. 3.Alimentiv London, ON · Contract research — clinical trials, imaging, precision medicine ↗300 worldwide
B

Largest places in SWO

By registry population; places with a full /local page are marked.

  1. 1.London, Ontario (Canada) full422,324
  2. 2.St. Thomas, Ontario full42,918
  3. 3.Strathroy-Caradoc, Ontario full23,870
  4. 4.Ingersoll, Ontario full13,695
  5. 5.Aylmer, Ontario full7,700
  6. 6.Mitchell, Ontario4,573
  7. 7.Port Stanley, Ontario3,008
  8. 8.Bayfield, Ontario1,112
R

Inside SWO

4 regions have SWO as their parent.

C

Companies based in SWO

260 companies in the Research Upon directory have their headquarters somewhere in SWO. Search them by name or industry.

areaAbout this page: figures for the whole of Southwestern Ontario (SWO) are rolled up from every region inside it; each place inside has a page of its own, and the companies headquartered here are listed above.