There is not, but it's not hard to discern. Here's the main OCDID repository:
The main ones I work with are here:
OCDIDs with the cd: prefix are for congressional districts, so members of congress. sldu: stands for State Legislative District Upper and is therefore equivalent to State Senate (though, in states with multi-member districts, state representatives will be returned with the legislatorLowerBody role). sldl: is State Legislative District Lower and is therefore equivalent to State House/Assembly.
The higher level, state: will contain state-level officials like Senators and Governors.
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Jason Rosenbaum
Director of Technology