Fastest Growing Indianapolis Suburbs: Aim Your Google Ads

The figures are Census Bureau estimates for July 1, 2025. The Indiana Business Research Center at IU's Kelley School of Business analyzed them, and the ring around Indianapolis led the state again. Boone and Hancock were Indiana's two fastest-growing counties for the third year in a row.

Growth is spreading outward too. Morgan and Madison counties grew 1.2% and 1.1%, and IBRC demographer Matt Kinghorn said Indy-area suburban growth continues to expand to new frontiers. The federal metro now spans 11 counties, after the 2023 update added Tipton, an InContext article notes.

Each county grows around different roads and towns.

• Hamilton County (Carmel, Fishers, Westfield, Noblesville). It added 7,351 residents in 2025, more than twice runner-up Johnson County. Carmel runs from 96th Street at the Marion County line north to 146th Street, with Michigan Road on its Boone County side. Fishers centers between I-69/S.R. 37 and Allisonville Road. Westfield sits nine miles north of Indianapolis, and Noblesville, the county seat, was platted along the east bank of the White River.
• Boone County (Zionsville, Lebanon). It grew 2.6%, the fastest rate in the state. Zionsville sits northwest of Indianapolis along S.R. 334, which is 116th Street there. Lebanon, the county seat, is on I-65 about 29 miles northwest of downtown. In May 2026, Lilly announced another $4.5 billion for its LEAP District manufacturing site in Lebanon, the Daily Journal reported.
• Hancock County (Greenfield). It grew 2.4%, second only to Boone. Greenfield, the county seat, sits about 25 miles directly east of Monument Circle.
• Johnson County (Greenwood). It added 3,239 residents, the second-largest gain in Indiana. Greenwood, the county's largest city, starts just south of the Marion County line, between Graham Road and S.R. 135.
• Hendricks County (Avon, Plainfield, Brownsburg). It grew 1.4%. Avon sits in the county's east end, about 14 miles from Monument Circle. Plainfield grew up along U.S. 40, and White Lick Creek flows north to south through Brownsburg.
• Marion County. It grew 0.2%, its smallest gain since 2021, and it still holds 992,196 people.

The core still matters. Marion County added 1,983 people in 2025, far below the 9,886 it added the year before, IU reported. It's still the state's most populous county, and IU ranks it the 52nd-largest county in the U.S.

It also pulls workers in. A 2017 IBRC analysis of commuting found Marion County is a net importer of workers. The ring counties send more workers out, mostly into Marion, than they take in. So a weekday ad near downtown offices can reach someone who sleeps in Fishers or Avon.

Drive times set the edges of a service area. Data USA puts the average Indianapolis commute at 24.6 minutes, and 71.8% of workers drove alone in 2024. The Indianapolis business guide covers the city's districts and main roads if you're mapping where your crews can reach.

Google Ads gives you a few shapes to work with. Google's location targeting help page says you can aim at whole countries, areas inside a country or a radius drawn around one spot.

• County. Use it when you'll take work anywhere in the county. Google's geotarget documentation lists counties as the level below states.
• City or ZIP code. Use it when you serve some towns and skip others, such as Westfield but not Lebanon. Google says you can target regions, cities or postal codes, depending on the country.
• Radius. Use it when drive time decides the job. Google won't take a radius under 1 km, and it cautions that tiny targets can leave ads showing only now and then.

A radius drawn to reach Avon, about 14 miles from Monument Circle, still falls short of Greenfield at about 25 miles. Check the map before you save it.

Then pick who counts as local. Google's broader Presence or Interest option can reach people who've shown interest in your locations, even from somewhere else. For businesses that only want people in their area, the same page points to the Presence option. Google adds that location targeting relies on signals such as settings, devices and behavior, so it can't be perfectly accurate.

Fund the core first. Your past jobs show where calls come from today, so that area keeps its budget. Give each growth county its own campaign and budget, so its cost per lead shows up on its own line.

“A fast-growing county doesn't mean its new families are searching for you yet. Give those towns a small budget of their own. The search terms will show you who's looking.”

Jeff Clerisier, founder of Trojan Digital Marketing

Use your numbers to size each slice. The lead cost calculator shows how much a lead can cost before a job stops paying. The guide to budgeting Google Ads for a service business walks through the math from job value and close rate.

If you're still deciding which areas deserve money at all, prioritize your Indianapolis service areas by fit, travel time and capacity first.

Someone who just moved to Westfield may not have a plumber, dentist or lawn crew yet. Name their town in the ad and on the landing page, so they can tell you come out there.

• New to Fishers? Meet your local plumber.
• Furnace repair for Greenfield and Hancock County.
• Serving Greenwood and Center Grove homes.
• Zionsville lawn care for new homeowners.

Pair the town name with something only you can say, like the neighborhoods you already work in. If you have reviews from jobs in that county, put them on the landing page. If you also run Meta or LinkedIn ads, the paid media page covers how search and social campaigns fit together.

Lavell C. left this Google review after a free consultation about ads.

“Jeff Clerisier did a free consultation with me, and informed me on how ads can help me generate more views on my content.”

Lavell C., Google review

The search terms report shows the searches that triggered your ads and how they performed. Google says it only lists terms that enough people searched, and it drops some rare searches for privacy.

Read it by town. Look for searches that name a place, such as electrician Noblesville or Plainfield dentist. Note which growth towns show up and which never do. If a town brings clicks but no calls, check the ad and the landing page before you cut it.

Add searches you don't want as negative keywords, which Google's page suggests for terms that don't fit what you offer. The guide to search terms and negative keywords shows how to sort them without blocking good buyers.

What are the fastest growing suburbs of Indianapolis?

By county, Boone grew fastest in 2025 at 2.6%, followed by Hancock at 2.4%, according to the Indiana Business Research Center. Hamilton County, home to Carmel, Fishers, Westfield and Noblesville, added the most people, 7,351. Johnson County added 3,239, the second-largest gain, while Marion County grew just 0.2%.

Should I target counties or a radius in Google Ads?

Match the target to how you work. A county or a list of cities fits a business that takes jobs anywhere in that area. A radius fits work where drive time decides the job. Google won't accept a radius under 1 km, and it cautions that tiny targets may show ads only now and then.

Is Marion County still worth advertising in?

For most local businesses near the core, yes. Marion County grew by only 1,983 people in 2025, but it still had 992,196 residents, the most of any Indiana county. A 2017 IBRC analysis found it's a net importer of workers, so weekday ads near offices can reach people who live in the ring counties.

How long should a new county campaign run before I judge it?

Give it at least a month, then read the search terms report by town. Google lists the searches that triggered your ads and how they performed, though it leaves out some low-volume terms for privacy. If a town brings clicks but no calls, check the ad and the landing page before you cut it.

Our Indianapolis PPC management page shows how we plan campaigns around real delivery areas and the services you accept. Tell us where your crews go through the contact page. The first strategy call is free, and during business hours we aim to reply within five minutes.