Numbered Markers in Leaflet (JS Mapping)

leaflet_numbered_markers.css

.leaflet-div-icon {
	background: transparent;
	border: none;
}

.leaflet-marker-icon .number{
	position: relative;
	top: -37px;
	font-size: 12px;
	width: 25px;
	text-align: center;
}

leaflet_numbered_markers.js

L.NumberedDivIcon = L.Icon.extend({
	options: {
    // EDIT THIS TO POINT TO THE FILE AT http://www.charliecroom.com/marker_hole.png (or your own marker)
    iconUrl: '<%= image_path("leaflet/marker_hole.png") %>',
    number: '',
    shadowUrl: null,
    iconSize: new L.Point(25, 41),
		iconAnchor: new L.Point(13, 41),
		popupAnchor: new L.Point(0, -33),
		/*
		iconAnchor: (Point)
		popupAnchor: (Point)
		*/
		className: 'leaflet-div-icon'
	},

	createIcon: function () {
		var div = document.createElement('div');
		var img = this._createImg(this.options['iconUrl']);
		var numdiv = document.createElement('div');
		numdiv.setAttribute ( "class", "number" );
		numdiv.innerHTML = this.options['number'] || '';
		div.appendChild ( img );
		div.appendChild ( numdiv );
		this._setIconStyles(div, 'icon');
		return div;
	},

	//you could change this to add a shadow like in the normal marker if you really wanted
	createShadow: function () {
		return null;
	}
});

usage.js

//Make sure you downloaded the image file in numbered_markers.js

//Note that the text could also be letters instead of numbers if that's more appropriate
var marker = new L.Marker(new L.LatLng(0, 0), {
    icon:	new L.NumberedDivIcon({number: '1'})
});

Great and clean solution.
Thank you!

Thank you for sharing your code, I have adapted it to use text intead of numbers, available here.

Thanks for sharing... helped to save a lot of time 👍

Thanks. FYI, I'm finding the .number div element for the number text introduces an issue meeting WCAG 2.0 success criteria:

Ensure that a contrast ratio of at least 4.5:1 exists between text (and images of text) and background behind the text.

The "background behind the text" in this case is transparent, and only the loaded icon image provides contrast for the text.

Do you have any suggestion?

excellent and thank you for sharing