CAMEO: Downloading MARPLOT for Macintosh

MARPLOT is a mapping application that is part of the CAMEO software suite, a system of software applications used widely to plan for and respond to chemical emergencies. Learn more about CAMEO and MARPLOT.

MARPLOT is the current version for the Macintosh. If you have an Intel-based Mac, you can run MARPLOT 4.2.5 in Windows using Boot Camp or virtualization software that allows you to run Windows on your Macintosh.

Downloading MARPLOT Version

Downloading the Program

Download MARPLOT by clicking the link below. Please review the installation instructions on this page before you install MARPLOT.

Download MARPLOT for the Macintosh (2 MB, DMG)

Users with Lion OS or later: The MARPLOT installer provided above will not work on a Macintosh with a Lion (10.7), Mountain Lion (10.8), Mavericks (10.9), or Yosemite (10.10) operating system, because the installer is a PowerPC application. To install MARPLOT on a computer running Lion or later, contact the CAMEO Suite Specialist (at for assistance.

Downloading the Manual

Click the link below to view or download the MARPLOT manual.


Downloading Maps

Census 2000 MARPLOT Maps are available at no cost. Contact the RMP Reporting Center at (703) 227-7650 or via e-mail at, to obtain maps for your area.

Installing MARPLOT

Once you have downloaded the installation program, the installation folder should open automatically. (If it doesn’t open automatically, browse to the folder and open it.) Double-click on the MARPLOT application installer icon. Follow the directions you’ll see on your screen.

Starting MARPLOT

Double-click on the MARPLOT program icon inside the "MARPLOT Folder" (which is inside the Applications folder or wherever you installed it).

What's new in MARPLOT version

  • Modified code to be compatible with Snow Leopard (OS X 10.6)
  • Fixed a few minor bugs