diff --git a/usr.bin/cpuset/cpuset.c b/usr.bin/cpuset/cpuset.c
--- a/usr.bin/cpuset/cpuset.c
+++ b/usr.bin/cpuset/cpuset.c
@@ -59,6 +59,7 @@
 static int iflag;
 static int jflag;
 static int lflag;
+static int Nflag;
 static int nflag;
 static int pflag;
 static int rflag;
@@ -244,7 +245,7 @@
 				    "prefer", "interleave" };
 
 static void
-printaffinity(void)
+printaffinityorcount(void)
 {
 	domainset_t domain;
 	cpuset_t mask;
@@ -252,17 +253,28 @@
 
 	if (cpuset_getaffinity(level, which, id, sizeof(mask), &mask) != 0)
 		err(EXIT_FAILURE, "getaffinity");
-	printf("%s %jd%s mask: ", whichnames[which], (intmax_t)id,
-	    levelnames[level]);
-	printset((struct bitset *)&mask, CPU_SETSIZE);
+	if (Nflag) {
+		printf("%s %jd%s CPU count: %d\n", whichnames[which],
+		    (intmax_t)id, levelnames[level], CPU_COUNT(&mask));
+	} else {
+		printf("%s %jd%s mask: ", whichnames[which], (intmax_t)id,
+		    levelnames[level]);
+		printset((struct bitset *)&mask, CPU_SETSIZE);
+	}
 	if (dflag || xflag)
 		goto out;
 	if (cpuset_getdomain(level, which, id, sizeof(domain), &domain,
 	    &policy) != 0)
 		err(EXIT_FAILURE, "getdomain");
-	printf("%s %jd%s domain policy: %s mask: ", whichnames[which],
-	    (intmax_t)id, levelnames[level], policynames[policy]);
-	printset((struct bitset *)&domain, DOMAINSET_SETSIZE);
+	if (Nflag) {
+		printf("%s %jd%s domain count: %d\n",
+		    whichnames[which], (intmax_t)id, levelnames[level],
+		    DOMAINSET_COUNT(&domain));
+	} else {
+		printf("%s %jd%s domain policy: %s mask: ", whichnames[which],
+		    (intmax_t)id, levelnames[level], policynames[policy]);
+		printset((struct bitset *)&domain, DOMAINSET_SETSIZE);
+	}
 out:
 	exit(EXIT_SUCCESS);
 }
@@ -300,7 +312,7 @@
 	level = CPU_LEVEL_WHICH;
 	which = CPU_WHICH_PID;
 	id = pid = tid = setid = -1;
-	while ((ch = getopt(argc, argv, "Ccd:gij:l:n:p:rs:t:x:")) != -1) {
+	while ((ch = getopt(argc, argv, "Ccd:gij:l:Nn:p:rs:t:x:")) != -1) {
 		switch (ch) {
 		case 'C':
 			Cflag = 1;
@@ -335,6 +347,9 @@
 			nflag = 1;
 			parsedomainlist(optarg, &domains, &policy);
 			break;
+		case 'N':
+			Nflag = 1;
+			break;
 		case 'p':
 			pflag = 1;
 			which = CPU_WHICH_PID;
@@ -368,17 +383,19 @@
 	if (gflag) {
 		if (argc || Cflag || lflag || nflag)
 			usage();
+		if (iflag && Nflag)
+			usage();
 		/* Only one identity specifier. */
 		if (dflag + jflag + xflag + sflag + pflag + tflag > 1)
 			usage();
 		if (iflag)
 			printsetid();
 		else
-			printaffinity();
+			printaffinityorcount();
 		exit(EXIT_SUCCESS);
 	}
 
-	if (dflag || iflag || rflag)
+	if (dflag || iflag || rflag || Nflag)
 		usage();
 	/*
 	 * The user wants to run a command with a set and possibly cpumask.
@@ -469,7 +486,7 @@
     "       cpuset [-c] [-l cpu-list] [-n policy:domain-list]\n"
     "              [-j jailid | -p pid | -t tid | -s setid | -x irq]\n");
 	fprintf(stderr,
-    "       cpuset -g [-cir]\n"
+    "       cpuset -g [-ciNr]\n"
     "              [-d domain | -j jailid | -p pid | -t tid | -s setid | -x irq]\n");
 	exit(1);
 }