Just the facts...
Stadium Statistics

Explanation

Stadiums are listed in chronological order, according to when they were first used in the major leagues, not necessarily when they were built. There is only one line of data per stadium, even for stadiums that went through two or more distinct "phases." Data generally pertain to the longest phase for each stadium, e.g, the 1937-1973 era for Yankee Stadium.

Orientation indicates the compass direction from home plate to center field. The third paragraph of the Official Baseball Rules says, "It is desirable that the line from home base through the pitchers plate to second base shall run East-Northeast." Indeed, that is the most common orientation, so as to keep the sun's glare out of the batter's field of vision. No MLB stadiums are oriented toward any direction between south-southeast (150 degrees) and northwest (315 degrees).

Capacity figures are broadly representative of the stadium's entire period of use; they are often rounded to the nearest thousand, reflecting the fact that the number of seats fluctuated from year to year.

Outfield dimensions likewise fluctuated over the years for some stadiums. Figures above generally show current dimensions (for ballparks still in use) or else represent the stadium's "typical" dimensions during its lifetime. Figures in parentheses diverge from the official dimensions, based on my own estimates or the estimates of experts published in Lowry's Green Cathedrals. There are various reasons for this, such as markers being placed at non-standard outfield locations. (Standard locations are: left field and right field down the line, straightaway center field, and the "power alleys" in left-center and right-center, defined as the angular midpoint between the foul lines and center field.) Discrepancies are explained on the respective stadium pages. If the discrepancy was within five feet or so, the official dimensions are used.

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Sources:

Lowry (2006), Ritter (1992), DeLorme Street Atlas USA (Mac version), ballparksofbaseball.com, www.ballparks.com, Official Baseball Rules (2004 Edition)