353 Area Code: Madison & Southwest Wisconsin's Overlay

The 353 area code is the newest code in southern and southwestern Wisconsin — a 2023 overlay layered on top of the long-standing 608. It covers the same region, anchored by Madison, the state capital, and reaching out to La Crosse, Janesville, and Beloit.

If you have been offered a 353 number, you are still firmly in the 608's footprint; 353 is simply the new code being issued as 608 runs out of numbers. One quick note: as a US area code, 353 is not the same as Ireland's +353 country code.

This guide covers where the 353 area code is, the Ireland mix-up, why the 608 needed an overlay, how the two codes work together, Madison's capital-and-research economy, dialing, and how to get a 353 number.

Where is the 353 area code?

The 353 area code location is southern and southwestern Wisconsin — the same region as 608. It covers the state capital and the rural counties around it, while Milwaukee to the east uses the 414 area code and the north and east use 920 and 715.

Cities and communities inside the 353 / 608 footprint include:

Is 353 an Ireland country code?

This is a common point of confusion, so let's clear it up: 353 is a US area code in Wisconsin — it is not Ireland. The mix-up happens because +353 is the international country code for the Republic of Ireland, so a number written +353 … is Irish, while a US number is written +1 353 …. The leading country code is what differs. If you see a "+1 353" number, it's southern Wisconsin; a "+353" number is Ireland.

Why the 608 got the 353 overlay

For decades, southern and southwestern Wisconsin ran entirely on 608 (one of the state's original 1947 area codes). As Madison's population and mobile lines grew, the 608 number pool was projected to run out.

Rather than split the region — which would have forced half the area to change numbers — Wisconsin regulators added the 353 overlay, in service since September 15, 2023. Existing 608 numbers keep working exactly as they are; 353 simply provides a fresh pool of numbers for new lines across the same area.

How 608 and 353 work together

Because 353 overlays 608, the two codes cover identical ground — neither signals a different city or carrier:

• Your existing 608 number does not change.
• New phone lines may be assigned 353 depending on availability.
• Ten-digit dialing is required on every call, even local ones.
• Calls between 608 and 353 are local, with no long-distance charge between them.

Madison: capital, university and health tech

The 608/353 region is one of the strongest mid-sized economies in the Midwest, anchored by Madison:

• Government — as Wisconsin's capital, Madison is a major center of state employment and public administration.
• Research and education — the University of Wisconsin–Madison is a top public research university, fueling a deep talent pipeline.
• Health technology — Epic Systems, the dominant electronic-health-records company, is headquartered just outside Madison, anchoring a large health-IT cluster.
• Agriculture and biotech — surrounding southwest Wisconsin is rich dairy and farm country, with a growing biotech presence.

For health-tech firms, professional services, agribusiness, and contractors, a 608 or 353 number reads as genuinely local to the Madison region.

353 time zone and dialing

The 353 area code time zone is Central Time (CT) — CST (UTC−6) in winter and CDT (UTC−5) in summer, the same clock as Chicago and the rest of Wisconsin. Because 353 shares an overlay with 608, ten-digit dialing is required on every call, including from cell phones. A 353 number works for calls and texts on mobile just like any US number: dial 1 353 XXX XXXX from elsewhere in the US, or +1 353 XXX XXXX internationally and from mobiles.

Putting a 353 number to work for your business

Because 353 is the code being issued to new lines, it is a natural fit for a business setting up in the Madison region — you get a genuinely local number without competing for scarce 608 inventory. A local code reads as familiar and lifts answer rates over an unknown out-of-state or toll-free line.

You do not need a Madison office to claim one. A cloud phone provider can assign you a 353 number that rings and texts on your existing devices and routes calls anywhere. With a provider like My Country Mobile, you can pick a 353 line, set up routing, an auto-attendant, and voicemail, and be live in minutes.

Staying safe from spoofed 353 calls

Because 353 is new, many people don't recognize it yet — which makes spoofed 353 calls and texts worth extra scrutiny. Fraudsters fake a local prefix so the contact looks like it's from southern Wisconsin.

A few habits keep you safe:

• Let unknown 353 or 608 calls go to voicemail, and don't tap links in unexpected texts.
• Never share one-time codes, card numbers, or login details with an inbound caller or texter.
• Be skeptical of "package delivery," "your account is locked," or prize-style messages that pressure you to act fast.
• Use carrier spam filtering. The FCC's STIR/SHAKEN call authentication framework is why many phones now label these as "Spam Risk."

Key takeaways

• 353 is the new overlay on 608 in Madison and southwest Wisconsin.
• It has been in service since September 15, 2023.
• It is a US Wisconsin code, not Ireland's +353 country code.
• Existing 608 numbers don't change; new lines may get 353, and ten-digit dialing is required.
• Madison anchors a capital, university, and health-tech economy, on Central Time.

Frequently asked questions