Flint, Lapeer, and Port Huron anchor the 810 area code, covering Genesee and Lapeer counties plus parts of Oakland, Macomb, St. Clair, Sanilac, and Livingston counties in east-central Michigan.
It's been in service since December 1, 1993, when it split off from 313 during the early-'90s fax-machine-and-cell-phone numbering crunch — and it's kept shrinking ever since, losing territory to 248 in 1997 and later to 586 as Metro Detroit's suburbs kept growing.
This guide covers 810's counties and cities, the twice-shrunk history that shaped today's footprint, what's driving demand across Flint and the Thumb, why a local number still matters here, and how much room is left in the numbering pool.
Counties and cities at a glance
| City | County | Region |
|---|---|---|
| Flint | Genesee | Genesee core |
| Lapeer | Lapeer | Northern Thumb |
| Port Huron | St. Clair | Blue Water region |
| Fenton | Genesee | Southern Genesee |
| Howell | Livingston | Southwest edge |
| Imlay City | Lapeer | Eastern Lapeer |
The area code that keeps shrinking
December 1, 1993 — 810 split off from 313, covering a wide swath of southeastern Michigan as Detroit's original code ran out of room for the era's fax lines, pagers, and early cell phones.
1997 — 248 split off Oakland County, the first territory 810 gave up.
Later — 586 split off Macomb County, narrowing 810's footprint again to roughly what it covers today: Genesee and Lapeer counties and the surrounding Thumb-region counties.
Unlike most of the codes in this guide series, 810 has never needed an overlay — it's simply been carved smaller twice as neighboring Metro Detroit suburbs outgrew their own numbering.
What's driving demand across Flint and the Thumb
810's economy blends legacy manufacturing with cross-border trade:
Auto industry heritage Flint's Buick City roots still anchor a base of manufacturing and supplier businesses across Genesee County.
Blue Water Bridge trade Port Huron sits directly across from Sarnia, Ontario, so St. Clair County sees steady cross-border commercial and logistics traffic.
Regional healthcare Flint-based hospital systems serve the wider Genesee and Lapeer County area, adding staff lines each year.
Many of these Genesee and Thumb-region businesses are moving their phone systems onto UCaaS (Unified Communications as a Service) — one cloud platform for calling, video, and messaging that scales as a company adds locations across the region, the same pattern behind newer overlays like 806 in the Texas Panhandle. Contact us to set up an 810 number for your Michigan business.
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Why a local 810 number still builds trust
For businesses serving Flint, Lapeer, or Port Huron, an 810 number signals "based here" in a way an out-of-area code doesn't — especially for home-service contractors, clinics, and local retailers whose customers expect a recognizable local caller ID before they pick up or call back. That local-trust effect matters even more in a region like this one, built on tight-knit legacy manufacturing towns rather than a fast-churning tech hub.
Number availability after two splits
Having already given up territory to both 248 and 586, the remaining 810 footprint carries considerably less numbering pressure than it did in the 1990s — there's no active overlay planning for the region today, and current projections don't show 810 approaching exhaustion any time soon.
Time zone & how to dial an 810 number
Flint and the Thumb run on Eastern Time (ET) — EST (UTC −5) in winter, EDT (UTC −4) during Daylight Saving Time. Ten-digit dialing has been mandatory since October 24, 2021, when Michigan regulators required it ahead of the new 988 crisis-line prefix: dial 1, then the area code, then the seven-digit number, for every local call.
Key takeaways
- 810 covers Flint, Lapeer, and Port Huron in east-central Michigan, in service since 1993.
- It has shrunk twice — losing territory to 248 in 1997 and later to 586.
- No overlay has ever been needed; the remaining footprint has ample numbering room.
- Anchors include the auto industry, Blue Water Bridge cross-border trade, and regional healthcare.
- Time zone: Eastern (ET), with mandatory 10-digit dialing since October 2021.
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Frequently asked questions
What is the 810 area code?
It covers Flint, Lapeer, and Port Huron in east-central Michigan, and has been active since 1993.
Where is the 810 area code located?
Genesee and Lapeer counties plus parts of Oakland, Macomb, St. Clair, Sanilac, and Livingston counties in Michigan's Thumb region.
Is 810 a Florida area code?
No. It has never been assigned to Florida — this is strictly a Michigan code.
What state is the 810 area code in?
Michigan — specifically Flint, Lapeer, and Port Huron.
What time zone is the 810 area code?
Eastern Time Zone (ET) — EST (UTC −5) in winter and EDT (UTC −4) during Daylight Saving Time.
Why has 810 shrunk twice but never gotten an overlay?
Its shrinking came from neighboring Metro Detroit suburbs (Oakland and Macomb counties) needing their own codes, not from 810 itself running short on numbers.
How do I get an 810 area code number?
Sign up with a VoIP provider such as My Country Mobile, search for available numbers in the 810 code, choose a Genesee or Thumb-region prefix, select a plan, and activate.
