It depends on several things. What type of orchestra? In a jazz orchestra, it's usually 4 but there are sometimes 5. In a symphony orchestra, on any given song it can be as few as 0 or 1 or 2, or as many as 10 or more. Some songs have no brass parts, some call for 1 or 2 trumpets, some call for 8 or 10. Symphony orchestra usually have 3 or 4 "regular" Trumpet players, and then they have alternates that they call when needed.
as many as you want
Trumpets are in Brass Section of an Orchestra.
There are no trumpets in Urinetown: trombone and euphonium (1 player) only.
They are found near the back of the orchestra near the double basses. the trumpets in an orchestra sit in the very back row smack dab in the middle with the french horns to their right and the trombones to their left.
brass
It depends on what type of orchestra, and what type of music. Some music has 2 or 3 trumpet parts, but sometimes you will see 5 or 6 trumpet parts.
there is four modern trumpets
There are about three to four trumpet players in an orchestra.
Trumpets are in Brass Section of an Orchestra.
Four
Trumpets are in orchestras because they add a tone and quality for many interments don't have, and other brass can not play notes as high. It rounds out the rest of the orchestra. Why not?!
Yes, trumpets are still a standard instrument in an orchestra or band.
There are no trumpets in Urinetown: trombone and euphonium (1 player) only.
They are found near the back of the orchestra near the double basses. the trumpets in an orchestra sit in the very back row smack dab in the middle with the french horns to their right and the trombones to their left.
brass
It depends on the orchestra. In full big band, there are 4 or 5 depending on what arrangements you play. In a symphonic orchestra or symphony there can be zero or as many as 8 or 10 depending on what music they are playing. It's all based on how many trumpets any particular arrangement of music has parts for.
usually near the trumpets and alto saxaphones
At least two french horns, four trombones, four trumpets, and two tubas.