There are a total of 93 U.S. Attorneys in the Department of Justice. As of 12 April 2018, 65 were nominated and 60 confirmed by the Senate. Last week, another three were confirmed (California, Central District; Hawaii; and Missouri, Western District) for a total of 63. In comparison to prior presidents, the number confirmed after 15 months in office: Reagan (71 after 1 year), Clinton (81), Bush (75), and Obama (51). Trump has done better than Obama but is underperforming the others.
Interim (with approval of district court) and acting US Attorneys can serve indefinitely until someone is approved by the Senate. Once confirmed, the person is limited to a four-year term. Some interim and acting appointees are nominated while others are not. Trump has not submitted nominees yet for the 28 districts below.
Interestingly, Rodriguez-Velez of Puerto Rico has been interim for over 10 years and Myers of North Dakota has been acting/interim for 3 years. Maybe there is something special about these two or the others listed causing the nomination submission slow roll. According to one article, eight of the top ten states with public corruption convictions are here. Sessions broke with long-standing tradition of appointing a Texan as head prosecutor for Nevada and a North Carolian as head prosecutor for U.S. Virgin Islands. Both of those have pretty bad crime problems.
District United States Attorney
Arizona Elizabeth A. Strange (acting)
California, Northern Alex G. Tse (acting)
California, Southern Adam L. Braverman (interim)
Colorado Robert C. Troyer (acting)
Florida, Middle Maria Chapa Lopez (interim)
Florida, Northern Christopher P. Canova (interim)
Florida, Southern Benjamin G. Greenberg (interim)
Guam & Northern Mariana Islands Shawn N. Anderson (interim)
Illinois, Central John E. Childress (interim)
Illinois, Southern Donald S. Boyce, Jr. (interim)
Louisiana, Eastern Duane A. Evans (interim)
Michigan, Eastern Matthew Schneider (interim)
Michigan, Western Andrew B. Birge (interim)
Minnesota Gregory G. Brooker (interim); Erica H. MacDonald (announced 4/10/18; not confirmed yet)
Nevada Dayle Elieson (interim)
New Jersey Craig Carpenito (interim)
New York, Eastern Richard Donoghue (interim)
New York, Northern Grant C. Jaquith (interim)
New York, Southern Geoffrey Berman (interim)
New York, Western James P. Kennedy (interim)
North Dakota Christopher C. Myers (acting and interim since Mar 2015)
Ohio, Southern Benjamin C. Glassman (acting)
Oklahoma, Western Robert J. Troester (acting)
Puerto Rico Rosa E. Rodriguez-Velez (interim since Jan 2007)
Rhode Island Stephen G. Dambruch (interim)
South Carolina Beth Drake (interim); Cheryl A. Lydon (announced 4/10/18; not confirmed yet)
Virgin Islands Gretchen C.F. Shappert (interim)
Virginia, Eastern Tracy McCormick (acting)
Washington, Eastern Joseph Harrington (interim)
Washington, Western Annette L. Hayes (interim)
https://en.wikipedia.org/wiki/United_States_Attorneys_appointed_by_Donald_Trump
https://www.justice.gov/usao/us-attorneys-listing
https://www.reviewjournal.com/local/local-nevada/choice-of-texan-as-nevada-us-attorney-breaks-from-tradition/
https://www.justice.gov/usao-vi/pr/attorney-general-jeff-sessions-appoints-gretchen-shappert-interim-united-states-attorney
http://www.pennlive.com/news/2017/03/which_states_are_the_most_corr.html
https://fivethirtyeight.com/features/ranking-the-states-from-most-to-least-corrupt/