You could try this, to get the sub directory names and the number of files/directories they contain:

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find . -maxdepth 1 -type d -exec bash -c "echo -ne '{} '; ls '{}' | wc -l" \;

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If you want to do the same for all sub directories (recursive find) use this instead:

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find . -type d -exec bash -c "echo -ne '{} '; ls '{}' | wc -l" \;

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To select those directories that have exactly 10 files:

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find . -maxdepth 1 -type d -exec bash -c "echo -ne '{} '; ls '{}' | wc -l" \; | 

  awk '$NF==10'

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10 or more:

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find . -maxdepth 1 -type d -exec bash -c "echo -ne '{} '; ls '{}' | wc -l" \; | 

 awk '$NF>=10'

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10 or less:

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find . -maxdepth 1 -type d -exec bash -c "echo -ne '{} '; ls '{}' | wc -l" \; | 

 awk '$NF<=10'

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If you want to keep only the directory name (for example of you want to pipe it to another process downstream as @evilsoup suggested) you can use this:

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find . -maxdepth 1 -type d -exec bash -c "echo -ne '{}\t'; ls '{}' | wc -l" \; | 

 awk -F"\t" '$NF<=10{print $1}'

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