# The 30 largest critical infrastructure operators in Indianapolis

Tamtam tracks 32 critical infrastructure operators headquartered in Indianapolis. This list ranks the 30 largest by number of employees on LinkedIn, led by Elevance Health, Indiana University Health and Anthem, Inc.. Their median headcount is 974. Half of them were founded in 1927 or later.

These Indianapolis-based companies are critical infrastructure operators, predominantly large organizations in the hospitals and health care sector. Elevance Health serves over 118 million people with integrated health services. Indiana University Health provides comprehensive healthcare and research. USIC offers underground utility damage prevention services, and Republic Airways is a regional airline.

The data shows a strong concentration of healthcare providers, with several large hospital networks and health systems headquartered in Indianapolis. Most of these companies are well-established, with some founded in the 19th and early 20th centuries, such as Eskenazi Health (1859) and St. Vincent Health (1881).

🇺🇸 Indianapolis · 30 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Elevance Health](https://www.tamtam.ai/c/elevance-health) (elevancehealth.com)<br>Serving over 118 million people with a digital platform and integrated health services, focusing on improving health at every stage. | Hospitals and Health Care | 🇺🇸 Indianapolis | 43,568 |  |
| 2 | [Indiana University Health](https://www.tamtam.ai/c/indiana-university-health) (iuhealth.org)<br>Provides comprehensive healthcare services, innovative treatments, and groundbreaking research through a partnership with Indiana University School of Medicine Prioritizes personal and professional growth | Hospitals and Health Care | 🇺🇸 Indianapolis | 20,779 |  |
| 3 | [Anthem, Inc.](https://www.tamtam.ai/c/anthem-inc) (elevancehealth.com)<br>A company formerly known as Anthem, Inc has rebranded as Elevance Health Follow them on their new LinkedIn page | Hospitals and Health Care | 🇺🇸 Indianapolis | 19,648 |  |
| 4 | [Anthem Blue Cross and Blue Shield](https://www.tamtam.ai/c/anthem-blue-cross-and-blue-shield) (anthem.com)<br>Dedicated to delivering better care to members, providing greater value to customers, and helping improve the health of communities through health plans. | Insurance | 🇺🇸 Indianapolis | 10,425 |  |
| 5 | [Community Health Network](https://www.tamtam.ai/c/community-health-network) (ecommunity.com)<br>A non-profit health system in Central Indiana providing a full continuum of care through hospitals, physicians, home care, and other services | Hospitals and Health Care | 🇺🇸 Indianapolis | 8,889 |  |
| 6 | [USIC](https://www.tamtam.ai/c/usic) (usicllc.com)<br>A leading provider of underground utility damage prevention services and utility solutions in the United States and Canada | Utilities | 🇺🇸 Indianapolis | 5,331 |  |
| 7 | [Republic Airways](https://www.tamtam.ai/c/republic-airways) (rjet.com)<br>A regional airline providing safe, reliable flights for major carriers with a fleet of Embraer jets and multiple bases across the US | Airlines and Aviation | 🇺🇸 Indianapolis | 4,334 | 1974 |
| 8 | [St. Vincent Health](https://www.tamtam.ai/c/st-vincent-health) (healthcare.ascension.org)<br>A healthcare organization operating 23 hospitals, medical practices, and clinics in central and southern Indiana, dedicated to compassionate care for all | Hospitals and Health Care | 🇺🇸 Indianapolis | 4,279 | 1881 |
| 9 | [Eskenazi Health](https://www.tamtam.ai/c/eskenazi-health) (eskenazihealth.edu)<br>Comprehensive healthcare provider offering primary and specialty medical services through hospital and community health centers, focusing on vulnerable populations. | Hospitals and Health Care | 🇺🇸 Indianapolis | 3,817 | 1859 |
| 10 | [IU Health Methodist Hospital](https://www.tamtam.ai/c/iu-health-methodist-hospital) (iuhealth.org)<br>A top-ranked hospital known for quality, safety, nursing excellence, and high-quality clinical outcomes, recognized nationally by University Health Consortium and US News & World Report | Medical Practices | 🇺🇸 Indianapolis | 1,724 |  |
| 11 | [Indiana Department of Transportation](https://www.tamtam.ai/c/indiana-department-of-transportation) (in.gov)<br>INDOT is a transportation agency in Indiana, offering dynamic opportunities for professionals to improve infrastructure, safety, mobility, and economic growth | Truck Transportation | 🇺🇸 Indianapolis | 1,722 | 1919 |
| 12 | [Riley Children's Health](https://www.tamtam.ai/c/riley-children-s-health) (rileychildrens.org)<br>Provider of comprehensive healthcare services for children across Indiana, with emphasis on care at Riley Hospital for Children in downtown Indianapolis | Hospitals and Health Care | 🇺🇸 Indianapolis | 1,492 | 1924 |
| 13 | [Franciscan St. Francis Health](https://www.tamtam.ai/c/franciscan-st-francis-health) (franciscanhealth.org)<br>A Catholic healthcare system with 14 hospital campuses in Indiana and Illinois, providing top-tier medical services and state-of-the-art facilities | Hospitals and Health Care | 🇺🇸 Indianapolis | 1,461 |  |
| 14 | [Indiana Department of Health](https://www.tamtam.ai/c/indiana-department-of-health) (health.in.gov)<br>The Indiana Department of Health provides and promotes essential public health services in the state | Wellness and Fitness Services | 🇺🇸 Indianapolis | 1,133 | 1881 |
| 15 | [Riley Hospital for Children](https://www.tamtam.ai/c/riley-hospital-for-children) (rileychildrenshospital.com)<br>A hospital and healthcare company in Indianapolis, Indiana, dedicated to providing specialized care for children at Riley Hospital for Children | Hospitals and Health Care | 🇺🇸 Indianapolis | 974 |  |
| 16 | [Marion County Public Health Department](https://www.tamtam.ai/c/marion-county-public-health-department) (marionhealth.org)<br>A health department serving Marion County, Indiana for nearly a century, promoting health, preventing disease, and protecting against injuries and disabilities | Hospitals and Health Care | 🇺🇸 Indianapolis | 834 |  |
| 17 | [Citizens Energy Group](https://www.tamtam.ai/c/citizens-energy-group) (info.citizensenergygroup.com)<br>A public trust providing clean, efficient, and reliable energy services to customers in the Indianapolis area, prioritizing customer service and community benefit | Utilities | 🇺🇸 Indianapolis | 778 | 1887 |
| 18 | [USPS](https://www.tamtam.ai/c/usps) (Usps.com)<br>Indianapolis area provider of towing, auto parts, scrap metal recycling, body shop services, auto auctions, and cash for cars | Transportation, Logistics, Supply Chain and Storage | 🇺🇸 Indianapolis | 732 |  |
| 19 | [St.Vincent Indianapolis Hospital](https://www.tamtam.ai/c/st-vincent-indianapolis-hospital) (healthcare.ascension.org)<br>Faith-based healthcare organization committed to providing compassionate, personalized care to those in need, operating hospitals, senior living facilities, and various healthcare services nationwide | Hospitals and Health Care | 🇺🇸 Indianapolis | 626 |  |
| 20 | [AES Indiana](https://www.tamtam.ai/c/aes-indiana) (aesindiana.com)<br>A company specializing in customized energy solutions, fostering innovation and collaboration to empower customer growth and achieve energy goals | Utilities | 🇺🇸 Indianapolis | 602 | 1927 |
| 21 | [HealthNet](https://www.tamtam.ai/c/healthnet) (indyhealthnet.org)<br>HealthNet is a Federally Qualified Health Center providing high-quality medical, dental, and behavioral health care regardless of insurance status They offer various rewarding healthcare careers | Hospitals and Health Care | 🇺🇸 Indianapolis | 586 |  |
| 22 | [IndyGo](https://www.tamtam.ai/c/indygo) (indygo.net)<br>Operating the public transit system for the City of Indianapolis, IndyGo has 30 fixed routes with 2,708 stops and carries five million passengers annually | Urban Transit Services | 🇺🇸 Indianapolis | 461 | 1973 |
| 23 | [Indianapolis Airport Authority](https://www.tamtam.ai/c/indianapolis-airport-authority) (ind.com)<br>A municipal corporation operating Indiana's largest airport system in the Indianapolis area, with a $54 billion economic impact and top rankings in customer satisfaction | Airlines and Aviation | 🇺🇸 Indianapolis | 427 | 1962 |
| 24 | [Indiana Members Credit Union](https://www.tamtam.ai/c/indiana-members-credit-union) (imcu.com)<br>A non-profit credit union in Indiana offering financial services including banking, loans, and online services to consumer and business members | Banking | 🇺🇸 Indianapolis | 374 | 1956 |
| 25 | [Federal Home Loan Bank of Indianapolis (FHLBI)](https://www.tamtam.ai/c/federal-home-loan-bank-of-indianapolis-fhlbi) (fhlbi.com)<br>Provides liquidity to member financial institutions, supports housing finance, community lending, and economic development through grants and loans. | Banking | 🇺🇸 Indianapolis | 367 | 1932 |
| 26 | [CountryMark](https://www.tamtam.ai/c/countrymark) (countrymark.com)<br>American-owned company in oil exploration, production, refining, and marketing Distributes premium fuels, lubricants, and DEF to farms, fleets, and families in the Midwest | Oil and Gas | 🇺🇸 Indianapolis | 342 |  |
| 27 | [The National Bank of Indianapolis](https://www.tamtam.ai/c/the-national-bank-of-indianapolis) (nbofi.com)<br>A locally-owned bank in Indianapolis offering banking services, wealth management, and superior customer service to professionals, businesses, and nonprofits | Banking | 🇺🇸 Indianapolis | 341 | 1993 |
| 28 | [Indiana Farmers Insurance](https://www.tamtam.ai/c/indiana-farmers-insurance) (indianafarmers.com)<br>Established in 1877, this mutual insurance company specializes in serving the Midwest region with a focus on strong relationships and community values | Insurance | 🇺🇸 Indianapolis | 267 | 1877 |
| 29 | [Richard L Roudebush Vamc](https://www.tamtam.ai/c/richard-l-roudebush-vamc) (indianapolis.va.gov)<br>This company offers healthcare services to veterans in Central Indiana and Eastern Illinois | Mental Health Care | 🇺🇸 Indianapolis | 236 |  |
| 30 | [Jane Pauley Community Health Center](https://www.tamtam.ai/c/jane-pauley-community-health-center) (janepauleychc.org)<br>A nonprofit health center in Central Indiana providing quality, affordable healthcare for all Offering medical, behavioral health, and dental services | Hospitals and Health Care | 🇺🇸 Indianapolis | 208 | 2009 |

## How this list is built

Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 11, 2026.

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- [Healthcare providers in Indianapolis](https://www.tamtam.ai/l/healthcare-providers-indianapolis) (34)
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## The same list elsewhere in United States

- [Critical infrastructure operators in the United States](https://www.tamtam.ai/l/critical-infrastructure-operators-united-states) (5,801)
- [Critical infrastructure operators in Texas](https://www.tamtam.ai/l/critical-infrastructure-operators-texas) (579)
- [Critical infrastructure operators in California](https://www.tamtam.ai/l/critical-infrastructure-operators-california) (483)
- [Critical infrastructure operators in New York State](https://www.tamtam.ai/l/critical-infrastructure-operators-new-york-state) (379)
- [Critical infrastructure operators in Florida](https://www.tamtam.ai/l/critical-infrastructure-operators-florida) (321)
- [Critical infrastructure operators in Illinois](https://www.tamtam.ai/l/critical-infrastructure-operators-illinois) (241)
- [Critical infrastructure operators in Pennsylvania](https://www.tamtam.ai/l/critical-infrastructure-operators-pennsylvania) (225)
- [Critical infrastructure operators in Alabama](https://www.tamtam.ai/l/critical-infrastructure-operators-alabama) (186)
- [Critical infrastructure operators in North Carolina](https://www.tamtam.ai/l/critical-infrastructure-operators-north-carolina) (171)
- [Critical infrastructure operators in Massachusetts](https://www.tamtam.ai/l/critical-infrastructure-operators-massachusetts) (165)
- [Critical infrastructure operators in Ohio](https://www.tamtam.ai/l/critical-infrastructure-operators-ohio) (153)
- [Critical infrastructure operators in Michigan](https://www.tamtam.ai/l/critical-infrastructure-operators-michigan) (150)
- [Critical infrastructure operators in Washington State](https://www.tamtam.ai/l/critical-infrastructure-operators-washington-state) (149)
- [Critical infrastructure operators in Colorado](https://www.tamtam.ai/l/critical-infrastructure-operators-colorado) (137)
- [Critical infrastructure operators in Tennessee](https://www.tamtam.ai/l/critical-infrastructure-operators-tennessee) (132)
- [Critical infrastructure operators in Virginia](https://www.tamtam.ai/l/critical-infrastructure-operators-virginia) (131)
- [Critical infrastructure operators in New Jersey](https://www.tamtam.ai/l/critical-infrastructure-operators-new-jersey) (130)
- [Critical infrastructure operators in Indiana](https://www.tamtam.ai/l/critical-infrastructure-operators-indiana) (129)
- [Critical infrastructure operators in Georgia](https://www.tamtam.ai/l/critical-infrastructure-operators-georgia) (126)
- [Critical infrastructure operators in Missouri](https://www.tamtam.ai/l/critical-infrastructure-operators-missouri) (120)
- [Critical infrastructure operators in Minnesota](https://www.tamtam.ai/l/critical-infrastructure-operators-minnesota) (115)
- [Critical infrastructure operators in Wisconsin](https://www.tamtam.ai/l/critical-infrastructure-operators-wisconsin) (115)
- [Critical infrastructure operators in Houston](https://www.tamtam.ai/l/critical-infrastructure-operators-houston) (161)
- [Critical infrastructure operators in New York](https://www.tamtam.ai/l/critical-infrastructure-operators-new-york) (139)

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Source: https://www.tamtam.ai/l/critical-infrastructure-operators-indianapolis