This week’s decision by the Colorado Supreme Court to disqualify former President Donald J. Trump from holding office again was the first victory for a sprawling legal effort that is still unfolding across the country.

At least 16 other states currently have pending legal challenges to Mr. Trump’s eligibility for office under the 14th Amendment, according to a database maintained by Lawfare, a nonpartisan site dedicated to national security issues. The lawsuits argue that he is barred because he engaged in an insurrection with his actions surrounding the Capitol riot on Jan. 6, 2021.

Four of these lawsuits — in Michigan, Oregon, New Jersey and Wisconsin — have been filed in state courts. Eleven lawsuits — in Alaska, Arizona, Nevada, New York, New Mexico, South Carolina, Texas, Vermont, Virginia, West Virginia and Wyoming — have been filed in federal district courts.

Cases in two of these states, Arizona and Michigan, were initially dismissed by a lower court but have been appealed. Another challenge has also been made in Maine.