AI answer engines favor local brands over national chains, study finds

A new state-by-state study suggests AI answer engines are not rewarding the biggest national chains so much as the brands with the deepest local trust. In 250 tests across ChatGPT, Claude, Perplexity, Gemini and Google AI Overviews, the five largest U.S. chains combined held the dominant recommendation in only seven states.

5W AI Communications released The 5W AI Trust Map of America on June 3, built as a five-volume series covering grocery, restaurants, banking, hotels and healthcare. The pattern is blunt: scale alone did not carry the day. Walmart, which operates stores in 49 states, was dominant in only two. McDonald’s, with a presence in 50 states, was also dominant in two. JPMorgan Chase, operating in 48 states, led three state answers. Marriott International, with more than 8,500 U.S. hotels, led zero. HCA, with 187 hospitals across 20 states, also led zero.

The clearest signal is that AI systems appear to be reading trust the way locals do. 5W says the answer engines favored founding-state press, regional editorial coverage, customer-experience folklore, community discussion volume and ranking-organization citations. In grocery, Costco dominated 12 states, while Walmart still lost the top answer in most places it serves. 5W said more than 40 states cited a retailer other than the state’s market leader.

Banking showed the same split. Chase led three states, but 11 states were won outright by a credit union or community bank. In Maine, Bangor Savings Bank outranked the national banks. That is the kind of result that should unsettle any marketer who still thinks footprint alone buys visibility.

Hotels may be the starkest example. Marriott’s scale did nothing for state-level answer placement, and 5W said every state’s best-hotel answer was a specific named property. Healthcare skewed even more local: 46 of the 50 state answers went to academic medical centers, not the biggest hospital chains. That points to a ranking layer that is learning from regional reputation, not just brand size.

5W says the volumes were modeled in May 2026, will be published through October, and will be updated quarterly through 2027 and 2028. The timing matters because search behavior is shifting underneath it. 5W says more than a third of U.S. consumers now begin product research with AI rather than Google, a finding that lines up with March 2026 Semrush survey work and recent reporting that 37% of consumers begin searches with AI tools. The message for national brands is not subtle: if the answer layer is localizing decisions, then the winning play is local authority, not national name recognition.