Not an answer to your question, but further proof of strange english usage. Have you ever noticed how when verbally describing a number, a lot of people describe the number zero as a letter 'O'. Take the following bus numbers:
200 = TWO HUNDRED
209 = TWO, OH, NINE (not two zero nine)
210 = TWO , TEN or TWO, ONE, OH
219 = TWO, NINETEEN
246 = TWO, FOUR, SIX
250 = TWO, FIFTY
There doesn't seem to be a set logic to how people say numbers other than they break them down to more memorable smaller numbers (and using 'OH').