The 1970 United States Senate election in Maryland took place on November 3, 1970. Incumbent Democratic U.S. Senator Joseph Tydings ran for re-election to a second term, but was narrowly defeated by Republican U.S. Representative J. Glenn Beall Jr.

Tydings had defeated Beall's father, Senator James Glenn Beall six years earlier. Tydings's own adoptive father Millard had served as senator as well as Beall Sr., making this a rare dynastic election between the sons of former senators.

, this was the last time a Republican won the Class 1 Senate seat in Maryland.

Democratic primary Candidates Walter Gilchrist Finch, Baltimore patent lawyer George P. Mahoney, nominee for Governor in 1966 Joseph Tydings, incumbent Senator Charles D. White

Results

Republican primary Candidates J. Glenn Beall Jr., U.S. Representative from Frostburg and son of former Senator J. Glenn Beall Sr. Wainwright Dawson Harry L. Simms

Results

Results

Results by county

+CountyJ. Glenn Beall RepublicanJoseph Tydings DemocraticHarvey Wilder AmericanMarginTotal Votes

Cast#%#%#%#% Allegany 16432 64.96% 8425 33.31% 437 1.73% 8007 31.66% 25294 Anne Arundel 39649 60.54% 24986 38.15% 857 1.31% 14663 22.39% 65492 Baltimore 101631 57.17% 74479 41.89% 1668 0.94% 27152 15.27% 177778 Baltimore City 66552 33.47% 128392 64.58% 3876 1.95% -61840 -31.10% 198820 Calvert 2854 56.68% 2141 42.52% 40 0.79% 713 14.16% 5035 Caroline 3034 70.79% 1227 28.63% 25 0.58% 1807 42.16% 4286 Carroll 12015 75.18% 3804 23.80% 163 1.02% 8211 51.38% 15982 Cecil 7527 63.67% 4184 35.39% 111 0.94% 3343 28.28% 11822 Charles 5828 58.50% 4062 40.77% 73 0.73% 1766 17.73% 9963 Dorchester 5119 69.81% 2108 28.75% 106 1.45% 3011 41.06% 7333 Frederick 14746 65.85% 7375 32.93% 272 1.21% 7371 32.92% 22393 Garrett 4701 78.93% 1182 19.85% 73 1.23% 3519 59.08% 5956 Harford 15405 60.27% 9940 38.89% 213 0.83% 5465 21.38% 25558 Howard 10097 61.95% 6061 37.19% 141 0.87% 4036 24.76% 16299 Kent 3502 65.37% 1818 33.94% 37 0.69% 1684 31.44% 5357 Montgomery 68020 43.08% 88952 56.33% 933 0.59% -20932 -13.26% 157905 Prince George's 59385 46.01% 68356 52.96% 1327 1.03% -8971 -6.95% 129068 Queen Anne's 3073 63.30% 1753 36.11% 29 0.60% 1320 27.19% 4855 St. Mary's 4298 54.38% 3555 44.98% 50 0.63% 743 9.40% 7903 Somerset 3995 68.37% 1805 30.89% 43 0.74% 2190 37.48% 5843 Talbot 4852 69.05% 2143 30.50% 32 0.46% 2709 38.55% 7027 Washington 19088 67.85% 8611 30.61% 435 1.55% 10477 37.24% 28134 Wicomico 9305 69.99% 3883 29.21% 106 0.80% 5422 40.79% 13294 Worcester 3852 75.93% 1180 23.26% 41 0.81% 2672 52.67% 5073 Total 484960 50.70% 460422 48.14% 11088 1.16% 24538 2.57% 956470

Counties that flipped from Democratic to Republican Anne Arundel Baltimore (County) Calvert Caroline Cecil Charles Frederick Harford Howard Kent Queen Anne's St. Mary's Talbot Washington Wicomico

See also 1970 United States Senate elections 1970 United States elections

References