A growing number of small-business owners are turning to large online-marketing firms to help them place ads on search engines like Google, but many are finding that the ads aren't reaching their target audiences.

Meghan Phelan Goicouria, the owner of a Granny Nannies home-care franchise in Miami, says she signed up for a package with online marketing firm ReachLocal Inc. in September 2013 after a salesman called out of the blue. He described it, she says, as "AdWords on steroids," a reference to Google's own paid-search-advertising service.

But soon after, Ms. Goicouria says she began receiving calls from out-of-state customers who had seen the ads but seemed to think her business was located in Texas or Virginia. She says she put in a request to cancel ReachLocal's service after she received no valid leads.

ReachLocal declined to comment on the specific case but the company's chief executive officer, Sharon Rowlands, says that erroneous leads aren't common and the company wouldn't have grown to the size it is today, with more than $514 million in revenue last year, if it wasn't delivering quality services.

Ferdous Haider, a digital-marketing consultant in Brisbane, Australia, recently examined several ad campaigns run by ReachLocal and other search-engine marketing firms using SEMrush--a tool that shows the terms users enter on Google that lead to search results. The findings, which were reviewed by The Wall Street Journal, found many instances of irrelevant search terms leading to advertisements.

Ads for a Chicago tailoring business--a customer of ReachLocal--came up on the first two pages of a Google search-results page when users searched phrases with New York, Houston and Los Angeles in them. In another example, the keyword phrase "small appliance repair Denver" brought up an ad for a local dentist, another ReachLocal client. And a cleaning franchise in California--a client of Yodle--surfaced when someone searched for "maids in UAE."

Since Google charges for ads on a cost-per-click basis, inviting traffic from users who aren't potential customers can waste an advertiser's money. For example, bidding on the keyword phrase "personal injury attorney Dallas" can cost more than $100 a click, according to Google's keyword-planning tool. Google declined to comment.

"It's so easy for one keyword to cannibalize a budget," says Andrew Rulnick, a former ReachLocal employee.

Software used by companies like ReachLocal can automatically bid on a plethora of irrelevant keywords, costing an advertiser hundreds of dollars, if an account manager doesn't monitor the results frequently and specify the terms to stop associating with an ad, says Eran Malloch, who formerly worked at ReachLocal in Australia.

Khadeeja Safdar

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