Here’s what we know so far.

Most of the Democratic candidates are now barreling toward the New Hampshire primary on Feb. 11. One prominent exception is Michael Bloomberg, the former New York City mayor, who is skipping the first four nominating contests but aggressively contesting larger states that begin voting in March.

Details: The Iowa votes counted so far reflect 71 percent of the precincts and are relatively representative of the state. But the margin between Mr. Buttigieg and Mr. Sanders — 26.8 percent and 25.2 percent, respectively, of the state’s delegate equivalents — is unusually slim.

Background: After a razor-close finish in Iowa between Hillary Clinton and Mr. Sanders in 2016, new standards this year required officials to submit three numbers — rather than one — from each of the state’s 1,600-plus precincts. That change, and a new app, slowed the reporting of results.

Go deeper: The app had been designed to help Democrats to match the Republicans’ prowess in digital advertising. Its misfires raise new questions about how the party hopes to compete with the Trump campaign in the presidential election.