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var markers = {
    atlanta: {
        title: 'Piedmont Atlanta',
        lat: 33.809105,
        lng: -84.393287
    },
    athens: {
        title: 'Piedmont Athens Regional',
        lat: 33.9611363,
        lng: -83.39827609999998
    }   
};

$.each( markers, function( i, marker ) {
    console.log(marker);
});

console.log( Object.keys(markers).length ); // 2