CDC Travelers' Health: Zika virus updates [slightly edited, emphasis mine]
March/11/2016
CDC has issued revisions to earlier Level 2 alert travel notices for countries and U.S. territories that have reported recent Zika virus transmission. With this revision, CDC recommends women who are pregnant should postpone travel to areas that are at elevations below 2,000 m (6500 feet) above sea level in countries and U.S. territories with ongoing Zika virus transmission.
The CDC alert page has information on these area:
Zika Virus in Cape Verde
Zika Virus in Mexico
The Caribbean
Currently includes: Aruba; Barbados; Bonaire; Curaçao; Dominican Republic; Guadeloupe; Haiti; Jamaica; Martinique; the Commonwealth of Puerto Rico, a US territory; Saint Martin; Saint Vincent and the Grenadines; Sint Maarten; Trinidad and Tobago; US Virgin Islands
Central America
Currently includes: Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, Panama
The Pacific Islands
Currently includes: American Samoa, Marshall Islands, New Caledonia, Samoa, Tonga
South America
Currently includes: Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Paraguay, Suriname, Venezuela
For all current travel notices, please visit the Zika travel information page.