If you mean question-submitters, the answer is about 140,000. If you include answer-submitters, the figure goes up.
Lots of people.
The park receives about 4 million visitors a year, which works out to an average of 333,000 per month. However, more visitors come in the summer than in the winter.
aprox. 80- 90 billion
nameberry.com has over 750,000 unique visitors per month.
44 million every month
They attract around 1500 visitors each month. More information on this topic is located on various online information websites such as Wikipedia and EHow.
More than 800,000 visitors a year
over 7 million.
Biscayne Bay National Park typically receives around half a million visitors annually.
4 or 5
The simple subject in the sentence is "visitors." "Many" is an adjective describing the number of visitors, not the subject itself.
Estimates say 7 million a year. So 583,333 visitors a month. Im sure higher in summer and lower in winter months.