Which month is located between "mayo" and "julio"?

The month that is located between "mayo" (May) and "julio" (July) is June. In the calendar, May is the fifth month, June is the sixth month, and July is the seventh month. Therefore, June directly follows May and precedes July, making it the correct answer.

The other months listed, such as April, August, and September, do not fall between May and July. April is before May, while August and September come after July in the sequence of the months. Hence, they cannot be the correct choice.