The early October reading fell short of the 76.0 forecast by economists recently polled by Reuters.
While the sentiment gauge declined for a third straight month, the size of the decrease was relatively small, as worries about a protracted shutdown were mitigated by some optimism about income and inflation, survey director Richard Curtin said.
"Consumer confidence posted a surprisingly small decline in early October despite widespread awareness of the government shutdown,'' Curtin said in a statement. "The muted response may be due to consumers giving progressively less credence to the economic scare tactics that have framed the debates over the past few years,'' he said.
There were few signs that President Barack Obama and top Republican lawmakers were close to an agreement to reopen the government and to increase the $16.7 trillion debt ceiling, which is expected to be exhausted on Oct. 17.
"To be sure, this can quickly change if the impasse continues,'' Curtin said of a possible further deterioration in consumer sentiment.
For now, the negative developments in Washington has hurt consumers' outlook rather than their current assessment on the economy and their own finances. The survey's gauge of consumer expectations fell to 63.9, the lowest level so far this year.
This compared with 67.8 in September and a forecast of 67.5. The index of current conditions edged up to 92.8 from 92.6 last month. Analysts had projected a reading of 91.0.
The one-year inflation expectation fell to 2.9 percent from 3.3 percent, while the five-to-10-year inflation outlook slipped to 2.8 percent from 3.0 percent.
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