<xsl:template match="County">
<xsl:value-of select="position()"/>
<xsl:text> </xsl:text>
<xsl:value-of select="."/>
</xsl:template>
For more complex numbering you can use xsl:number.
Michael Kay
http://www.saxonica.com/
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference