Nearly 1 in 10 ballots could not be delivered to Baltimore City voters during the special election in April, raising concerns for the June 2 primary, which is also being conducted by mail. The data, released by the Maryland Board of Elections late Tuesday, shows that 20,367 of the more than 230,500 ballots sent to Baltimore City voters could not be delivered before the April 28 special election. An additional 4,355 ballots were undeliverable to Baltimore County voters, while 3,886 were not delivered to Howard County voters — about 3% of all ballots in those two jurisdictions. The figures are being calculated as state election officials take stock of the lessons learned from Maryland’s first election held primarily by mail. The special election, which was held to choose a successor for the late U.S. Rep. Elijah Cummings, a Democrat, was conducted by mail by order of Republican Gov. Larry Hogan in response to the new coronavirus pandemic. The rapidly spreading virus has killed nearly 1,700 Marylanders and sickened more than 34,000 others, forcing the closure of businesses and a stay-at-home order that has been in place for Maryland residents since March. More than 480,000 ballots were mailed for the special election, which included only voters in Maryland’s 7th Congressional District. The district includes parts of Baltimore City, Baltimore County and Howard County. Voters were strongly encouraged to return the ballots via mail using postage-paid envelopes or by placing them in drop boxes offered in each of the three jurisdictions in the district.