Thanks to commenter Mark we can share the following analysis of political party activity around McHenry County:

Number (and percentage) of precincts with a Precinct Committeeman candidate in the March 20, 2018 primary election, sorted by township and political party, as of December 18, 2017.

Township – Republican – Democrat

Alden – 1 of 1 (100%) – 0 of 1 (0%)

Algonquin – 20 of 68 (29%) – 17 of 68 (25%)

Burton – 1 of 3 (33%) – 1 of 3 (33%)

Chemung – 3 of 5 (60%) – 0 of 5 (0%)

Coral – 3 of 3 (100%) – 2 of 3 (67%)

Dorr – 10 of 14 (71%) – 5 of 14 (36%)

Dunham – 1 of 1 (100%) – 1 of 1 (100%)

Grafton – 13 of 31 (42%) – 7 of 31 (23%)

Greenwood – 3 of 7 (43%) – 2 of 7 (29%)

Hartland – 1 of 2 (50%) – 0 of 2 (0%)

Hebron – 1 of 2 (50%) – 1 of 2 (50%)

Marengo – 2 of 4 (50%) – 1 of 4 (25%)

McHenry – 32 of 35 (91%) – 11 of 35 (34%)

Nunda – 26 of 29 (90%) – 10 of 29 (34%)

Richmond – 4 of 4 (100%) – 2 of 4 (50%)

Riley – 1 of 1 (100%) – 1 of 1 (100%)

Seneca – 1 of 2 (50%) – 1 of 2 (50%)

Total McHenry County precincts with a candidate for Precinct Committeeman in the March 20, 2018 primary:

• Republican – 123 of 212 (58%)
• Democrat – 62 of 212 (29%)

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After petition challenges were settled, there are 14 Republican contested primaries (precincts with more than one Republican candidate):

• Algonquin Township  -1
• McHenry Township – 13

There is 1 Democrat contested primary, in Grafton Township.

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67 of 212 (32%) precincts have neither a Republican nor a Democrat Precinct Committeeman candidate.