463 Area Code: Indianapolis and Central Indiana — The 317 Overlay

Introduction

The 463 area code is a full overlay on 317. Together they cover Indianapolis and most of central Indiana. Indianapolis is the state's capital and its largest city. It's home to Eli Lilly and Company, the world's third-largest drug maker by market value. It's also home to the Indianapolis Motor Speedway, the biggest spectator sports venue on Earth. Salesforce's tallest tower outside San Francisco sits at the center of the downtown skyline. Lilly has helped build a large healthcare and life-sciences industry around it, making Indianapolis one of the most drug-industry-heavy mid-sized cities in the country.

This guide covers where 463 reaches, and Indianapolis's pharmaceutical, tech, and motorsports industries. It also covers Eastern Time calling hours, the 2015 overlay history, and how to get a 463 number with STIR/SHAKEN attestation from day one.

Where the 463 area code reaches

• Marion County — Indianapolis city proper, including the Mile Square downtown, Meridian-Kessler, Broad Ripple, Fountain Square, and the airport corridor
• Hamilton County — Carmel, Fishers, Noblesville, and Westfield — the fast-growing northern suburbs and home to a major biotech and software cluster
• Boone County — Zionsville and Lebanon, the wealthy northwestern suburbs
• Hendricks County — Avon, Brownsburg, and Plainfield — the western suburbs and Indianapolis Airport logistics corridor
• Johnson County — Greenwood, Franklin, and the southern suburban communities
• Shelby County — Shelbyville and the eastern agricultural communities
• Morgan County — Martinsville and the communities southwest of Indianapolis

Because 463 is a full overlay on 317, 10-digit dialing is mandatory throughout the footprint. That includes calls between two 317 numbers or two 463 numbers on the same exchange.

Indianapolis International Airport sits in the Hendricks County corridor. It's home to the second-largest FedEx Express hub in the world, after Memphis. That 2.4-million-square-foot sorting facility opened in 1988. It now handles up to 99,000 packages an hour. This cargo hub makes the western suburbs one of the busiest shipping areas in the whole 463 footprint. It adds a third major industry, alongside drugs and motorsports.

Hamilton County has its own claim to fame beyond biotech. Since the late 1990s, Carmel has built more than 160 roundabouts. They replaced nearly every traffic light in the city. That earned Carmel the nickname "roundabout capital of the United States." Carmel alone holds roughly 2% of every roundabout in the country. Traffic engineers now study the redesign for how much it cut crashes. It's a small example of how carefully central Indiana's fastest-growing suburbs have been planned. More detail sits on our letsdial page.

Indianapolis: Eli Lilly, Salesforce, and the racing capital

Eli Lilly and the pharmaceutical anchor

Eli Lilly and Company was founded in Indianapolis in 1876. It's still headquartered on the south side of downtown. It's the city's largest private employer and one of the world's top ten drug makers by revenue. Lilly's insulin, Prozac, and Trulicity brands, plus new cancer and immune-disease drugs, have made Indianapolis an unofficial capital of US drug manufacturing. The company has helped grow a large biotech and CRO (contract research organization) industry across Hamilton County and the I-465 loop.

Salesforce Tower and the technology sector

Salesforce Tower Indianapolis is 49 stories tall, the tallest building in Indiana. It's the clearest sign of the city's tech ambitions. Salesforce built a strong Indianapolis presence when it bought ExactTarget, a company headquartered here, in 2013 for $2.5 billion. That deal brought thousands of engineering, marketing, and sales jobs to the 463 market. It also sparked a wider tech startup scene centered on the Mass Ave and Bottleworks District areas.

Indianapolis Motor Speedway and motorsports economy

The Indianapolis Motor Speedway sits in Speedway, in Marion County. It seats more than 250,000 people, the largest sports venue on Earth for a single event. The Indy 500 runs every Memorial Day weekend. It's the world's largest single-day sporting event by attendance. The racing economy goes well beyond race day. Indianapolis is home to dozens of IndyCar and NASCAR teams, along with the suppliers and engineers who support them. That makes it a real motorsports engineering hub, alongside its drug-industry identity.

Professional sports beyond racing

Indianapolis's sports economy goes well past the Speedway. Lucas Oil Stadium is a 62,000-seat stadium downtown with a retractable roof. It has hosted the Indianapolis Colts since 2008, plus a Super Bowl and several NCAA Final Fours. Gainbridge Fieldhouse sits in the heart of downtown. It's home to the NBA's Indiana Pacers and the WNBA's Indiana Fever. That gives the 463 area four pro sports teams within a few blocks of each other. Few mid-sized cities can match that much downtown sports and entertainment in one place. It also drives a lot of hotel, restaurant, and event-related calls all year.

The NCAA moved its national headquarters from Kansas City to downtown Indianapolis in 1999. The NCAA Hall of Champions on West Washington Street is now part of the city's identity as a college-sports hub, alongside its pro teams. Monument Circle sits at the exact center of downtown Indianapolis. It's dominated by the 284-foot Soldiers' and Sailors' Monument, dedicated in 1902 and still the city's best-known landmark. The traffic circle around it was long home to Anthem, now called Elevance Health, one of the largest health insurers in the country. Elevance Health is still headquartered in Indianapolis after moving to Virginia Avenue in 2018. More detail sits on our letsdial page.

Healthcare and life sciences in the 463 footprint

Beyond Eli Lilly, Indianapolis is home to Indiana University Health (IU Health), the state's largest hospital system. It also hosts Ascension St. Vincent, Franciscan Health, and the Richard L. Roudebush VA Medical Center. The Indiana Biosciences Research Institute and the Central Indiana Corporate Partnership have put hundreds of millions into life-sciences buildings and labs. Roche Diagnostics also runs its North American headquarters in Carmel, in Hamilton County. Together, this gives Indianapolis an unusually deep pool of healthcare and life-sciences talent for a city its size.

Indianapolis also has a real claim to being a birthplace of the modern electronic health record. The Regenstrief Institute was founded in 1969. In 1972 it built one of the country's first electronic medical record systems, for what is now Eskenazi Health. It later built the Indiana Network for Patient Care, one of the oldest and largest health-data sharing networks in the country. It now links billions of records across hospitals and providers statewide. That history has made Indianapolis a real hub for health-tech and research talent, not just drug manufacturing.

Time zone and calling hours for 463

Indianapolis and most of central Indiana run on Eastern Time year-round: UTC-5 in winter (EST) and UTC-4 during Daylight Saving (EDT). Indiana was one of the last states to adopt statewide Daylight Saving Time, in 2006. Indianapolis shares its clock with New York, Philadelphia, and Washington DC. West Coast callers are three hours behind, so plan outbound calls before 2 p.m. Pacific to reach the full Indianapolis business day.

463 history: overlay on 317 in 2015

Indianapolis has used the 317 area code since the NANP's original 1947 assignments. It's one of the original codes, and it has served Indiana's capital without ever being split. Through the 2000s, central Indiana's population and mobile phone use grew fast, and the 317 pool of numbers ran low. The Indiana Utility Regulatory Commission approved 463 as a full overlay on 317 in 2015, which also made 10-digit dialing mandatory. Both codes carry equal standing in the Indianapolis market.

How to get a 463 number

1. 1Cloud phone platform — search available 463 numbers and activate an Indianapolis line the same day. letsdial provisions a central Indiana number in under three minutes on a free trial, no credit card required.
2. 2Port your existing 317 or 463 number — already on another carrier? Port it in at no charge with no call downtime during the transition.
3. 3Wireless or landline carrier — valid for a physical device but slower to provision and harder to scale without per-seat hardware.

> [TIP] Note: letsdial applies STIR/SHAKEN A-level attestation automatically on every 463 number. It also handles 10DLC registration for text campaigns, so your Indianapolis number is verified from the first call.

463 is officially documented under the North American Numbering Plan, which governs area code assignments across the US, Canada, and the Caribbean. That record is published in full as North American Numbering Plan.

Conclusion

The 463 area code overlays 317 across Indianapolis and central Indiana. Its footprint includes Eli Lilly's global drug headquarters, Salesforce Tower, the Indianapolis Motor Speedway, IU Health, and the Hamilton County biotech corridor. A local 463 number gives a business instant credibility in a mid-sized market with an outsized share of pharma, tech, and healthcare jobs.

Letsdial provisions 463 numbers in under three minutes — STIR/SHAKEN attestation and 10DLC text registration included, no credit card required. Search available Indianapolis-area numbers today.

Frequently Asked Questions