We present a catalog of 1147 candidate common proper motion binaries selected from the revised New Luyten Two-Tenths Catalog ( NLTT ) .
Among these , we identify 999 genuine physical pairs using the measured proper-motion difference and the relative positions of each binary ’ s components on a reduced proper-motion ( RPM ) diagram .
The RPM positions also serve to classify them as either disk main-sequence ( 801 ) , halo subdwarf ( 116 ) , or pairs containing at least one white dwarf ( 82 ) .
The disk and halo samples are complete to separations of \Delta \theta = 500 ^ { \prime \prime } and \Delta \theta = 900 ^ { \prime \prime } , which correspond to \sim 0.1 pc and \sim 1 pc , respectively .
At wide separations , both distributions are well described by single power laws , dN / d \Delta \theta \propto ( \Delta \theta ) ^ { - \alpha } : \alpha = 1.67 \pm 0.07 
for the disk and \alpha = 1.55 \pm 0.10 for the halo .
The fact that these distributions have similar slopes ( and similar normalizations as well ) argues for similarity of the star-formation conditions of these two populations .
The fact that the halo binaries obey a single power law out to \sim 1 pc permits strong constraints on halo dark-matter candidates .
At somewhat closer separations ( 10 ^ { \prime \prime } \lesssim \Delta \theta \lesssim 25 ^ { \prime \prime } ) , the disk distribution shows a pronounced flattening , which is detected at very high statistical significance and is not due to any obvious systematic effect .
We also present a list of 11 previously unknown halo stars with parallaxes that are recognized here as companions of Hipparcos stars .