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In this letter we present an overview of the rich population of systems withmultiple candidate transiting planets found in the first four months of Keplerdata. The census of multiples includes 115 targets that show 2 candidateplanets, 45 with 3, 8 with 4, and 1 each with 5 and 6, for a total of 170systems with 408 candidates. When compared to the 827 systems with only onecandidate, the multiples account for 17 percent of the total number of systems,and a third of all the planet candidates. We compare the characteristics ofcandidates found in multiples with those found in singles. False positives dueto eclipsing binaries are much less common for the multiples, as expected.Singles and multiples are both dominated by planets smaller than Neptune; 69+2/-3 percent for singles and 86 +2/-5 percent for multiples. This result, thatsystems with multiple transiting planets are less likely to include atransiting giant planet, suggests that close-in giant planets tend to disruptthe orbital inclinations of small planets in flat systems, or maybe even toprevent the formation of such systems in the first place.

A First Comparison of Kepler Planet Candidates in Single and Multiple Systems