Washington, D.C., has no 'J' Street because city designer Pierre L'Enfant bore a grudge against Chief Justice John Jay.

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The most plausible explanation is that J Street was omitted because the letters I and J were often indistinguishable from each other (especially when handwritten), and in 18th century English they were still largely interchangeable. (The 1740 "New General English Dictionary" published in London had a single section for I and J, and the standard identification Thomas Jefferson used on his personal possessions was "T.I.") Having both an "I" and a "J" street would have been redundant at best and confusing at worst, so "J" ended up as the odd man out.