Which term describes a district where elections are highly competitive and the incumbent is at risk?

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A district where elections are highly competitive and the incumbent is at risk is described as a marginal district. In these districts, the margin of victory is small, meaning either party has a real chance to win, and the current officeholder could lose in the next election. This contrasts with safe districts, where the incumbent enjoys a comfortable margin and is unlikely to be defeated. An open-seat district involves no incumbent running, which is not the same as the incumbent being at risk. A gerrymandered district involves boundary drawing to favor a party, not necessarily the level of electoral risk for the incumbent. Marginal districts capture the idea of real electoral competition and incumbent vulnerability.