Quick answer: The 513 area code covers southwest Ohio, centered on Cincinnati, across six counties (Hamilton, Butler, Warren, Clermont, Preble, Clinton). It sits in the Eastern Time Zone, is an original 1947 code, and now shares its territory with the 283 overlay (live April 28, 2023), so 10-digit dialing is mandatory.
Ask anyone in Cincinnati for their number and the first three digits are almost always the same. The 513 area code has been the signature of southwest Ohio since 1947 — one of the original prefixes assigned when the North American Numbering Plan first launched.
But the region's numbering map has changed recently, and a lot of older guides have not caught up. There is now a second area code sharing the same streets.
This guide gives you the accurate picture for 2026: which cities and counties the prefix covers, its real history, the current dialing rules after the 283 overlay, and how to get a Cincinnati number of your own.
What the 513 Area Code Covers
The 513 area code serves the southwest corner of Ohio, anchored by Cincinnati and stretching across the metro and several neighboring counties.
It is a compact but dense region — one of Ohio's busiest, with a mix of urban core, suburbs and smaller towns.
Cities in the Region
The prefix reaches well beyond Cincinnati itself. Communities served include:
- Cincinnati — the central hub and largest city
- Hamilton and Middletown — major cities to the north
- Mason, West Chester and Lebanon — fast-growing suburbs
- Norwood, Milford, Oxford and Harrison — smaller surrounding towns
Counties Served
The 513 region spans portions of six southwest Ohio counties: Hamilton, Butler, Warren, Clermont, Preble and Clinton. Hamilton County, which contains Cincinnati, holds the largest share of numbers.
Time Zone
Southwest Ohio sits in the Eastern Time Zone (ET) and observes Daylight Saving Time. That puts the region an hour ahead of Chicago and on the same clock as New York.
A Short History of the 513 Area Code
This prefix has one of the longest track records in the country. Knowing its history explains why a second code became necessary.
From Statewide to Regional
In 1947, the 513 area code launched as one of Ohio's three original codes, covering a large swath of the state. As phone demand grew, the territory shrank.
In 1996, the 937 area code was split off to serve western Ohio, narrowing 513 down to the Cincinnati metro it covers today.
Key Milestones
| Year | Event |
|---|---|
| 1947 | 513 introduced as an original NANP area code |
| 1996 | 937 split off for western Ohio |
| 2023 | 283 overlay added to the Cincinnati region |
The 283 Overlay — What It Means for You
Here is the part most quick searches get wrong. The 513 region is now an overlay area — two codes, one geography.
The Public Utilities Commission of Ohio approved the new 283 area code, and it went live as an all-service overlay on April 28, 2023. New numbers in the region may now be assigned either 513 or 283.
How an Overlay Works
An overlay does not split the region or change anyone's existing number. If your number is 513, it stays 513 — permanently.
The 283 code simply expands the supply of available numbers across the same six-county footprint.
Both Codes Are Equally Local
A 283 number is just as much a Cincinnati number as a 513 one. Friends, businesses and new lines in the area may carry either prefix, and neither signals anything different.
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How to Dial 513 Numbers Correctly
Dialing rules in southwest Ohio are now straightforward, and they are the same for every number in the region.
10-Digit Dialing Is Required
Because of the 283 overlay, all local calls must use the full 10 digits — area code plus the seven-digit number. Seven-digit dialing no longer connects.
This applies whether you are calling a 513 or a 283 number, and it is permanent.
Quick Dialing Reference
| Call Type | How to Dial | Example |
|---|---|---|
| Local call within the region | 10-digit number | 513-555-0123 |
| Long-distance call (US) | 1 + 10-digit number | 1-614-555-0123 |
| Toll-free number | 1 + 10-digit number | 1-800-555-0123 |
| International call | 011 + country code + number | 011-44-20-7946-0000 |
One Common Misconception
Many people assume the 513 prefix is "Cincinnati only." It is not — it covers a six-county region, so plenty of 513 callers are in Mason, Hamilton or Lebanon rather than the city itself.
Why a Local Cincinnati Number Is Worth It
A local number does quiet work for a business. People answer numbers they recognize, and they trust contacts that look like their own.
It Builds Instant Credibility
A 513 number signals that your business belongs to the southwest Ohio community. That perception sticks even if your team is remote.
It Lowers Customer Hesitation
Local customers expect a local point of contact. An unfamiliar out-of-state number gives some callers a reason to pause — a local line removes it.
It Is Flexible and Affordable
A virtual 513 number can forward to any device and scale with your team, with none of the cost of a physical office in the region.
Put a Cincinnati presence to work for your business. MCM virtual numbers include call forwarding, custom greetings and voicemail transcription.
How to Get a 513 Phone Number
Securing a 513 number is a short process once you know what to check for.
Step 1: Pick a Provider
Traditional carriers offer 513 numbers, but VoIP providers — MCM among them — typically deliver faster setup, lower cost and more built-in features.
Step 2: Check Availability
With the 283 overlay now active, fresh 513 numbers are less abundant than before. Confirm your provider can still issue the 513 prefix if that specific code matters to you.
Step 3: Activate or Port In
You can activate a new 513 number outright, or port an existing number to a new provider while keeping the digits you already use.
What to Look For in a Provider
Prioritize reliability, clear pricing and the features your operation needs — call recording, auto-attendant, voicemail-to-email — plus room to scale as call volume grows.
The Bottom Line
The 513 area code carries 75-plus years of Cincinnati history, and it is still the region's defining prefix. The one change worth remembering is the 283 overlay — it makes 10-digit dialing the permanent rule for everyone.
If you want a foothold in southwest Ohio, start by confirming number availability with a provider you trust. A local Cincinnati line is one of the easiest ways to look established in the market.
When you are ready, MCM can have a 513 number live for you in minutes — no contract, no waiting.
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FAQs
Where is the 513 area code located?
It covers the southwest corner of Ohio, centered on Cincinnati. The region includes parts of Hamilton, Butler, Warren, Clermont, Preble and Clinton counties.
Is there an overlay for the 513 region?
Yes. The 283 area code was added as an all-service overlay on April 28, 2023. It serves the same geographic area, so new numbers may be either 513 or 283.
Do I need to dial 10 digits for local calls?
Yes. Ten-digit dialing is mandatory for all local calls in the region because of the 283 overlay. Seven-digit dialing no longer works.
What time zone is Cincinnati in?
Cincinnati and the rest of southwest Ohio observe Eastern Time (ET), including Daylight Saving Time.
When was the 513 area code created?
It was introduced in 1947 as one of Ohio's three original NANP area codes. The 937 code was split off from it in 1996.
Is a 283 number as good as a 513 number?
Yes. Both serve the identical six-county region and are equally local. The 513 prefix is simply the older, more recognizable of the two.
Can I get a 513 number if I live outside Ohio?
Yes. VoIP providers can assign a 513 number regardless of your physical location, which is common for businesses targeting the Cincinnati market.
