<div id="map1"></div>
...var map = L.map('map1').setView([37.8, -96], 4);...
<div id="map2"></div>
...var map = L.map('map2').setView([37.8, -96], 4);...
<div id="map3"></div>
...var map = L.map('map3').setView([37.8, -96], 4);...

var info = L.control();
info.onAdd = function (map) {
    this._div = L.DomUtil.create('div', 'info'); // create a div with a class "info"
    this.update();
    return this._div;
};
// method that we will use to update the control based on feature properties passed
info.update = function (props) {
    this._div.innerHTML = '<h4>US Population Density</h4>' +  (props ?
        '<b>' + props.name + '</b><br />' + props.density + ' people / mi<sup>2</sup>'
        : 'Hover over a state');
};
info.addTo(map);

var map = L.map('map1');
var map = L.map('map2');
var map = L.map('map3');

<!-- Just sheets of paper we can draw on, nothing more -->
<div id="weather"></div>
<div id="population"></div>
<div id="healthcare"></div>

// Stop eating the crayons
var map = L.map('weather');

var map = L.map('population');

var map = L.map('healthcare');

var weatherMap = L.map('weather');
var populationMap = L.map('population');
var healthcareMap - L.map('healthcare');

var maps = [
    L.map('weather'),
    L.map('population'),
    L.map('healthcare')
];